QUESTION 36 Which of the following is true about photoreceptors? The retina also contains the nerves that tell the What can you conclude from this? C) A photoreceptor in the light … a) Photoreceptors depolarize to light. Because of the evolutionary constraints on the development of photoreceptors in the eye : b. c. Photoreceptors respond to light stimuli. Axons make up a majority of the matter in a nerve. Photoreceptors. Tonic receptors. b).It is attached to the retina by suspensory ligaments. Set I a. If you think of the eye as a camera, the retina would be the film. This part of the eye changes shape to control the amount of light that enters the eye. C) In dim light, images are focused directly on the rods in the fovea centralis. B) brain. Which of the following is true about photoreceptors? Which of the following statements about the human eye is false? When light enters the retina, it passes the ganglion cells and bipolar cells before reaching photoreceptors at the rear of the eye. B) photoreceptors are much less sensitive to stimulation. Exam 3 - Zoology 250 Version A KEY. Question. Which of the following is true of olfaction? A) sensory receptors B) brain C) motor endings D) ganglia. Disruption of transient photoreceptor targeting within the inner plexiform layer following early ablation of cholinergic amacrine cells in the ferret - Volume 18 Issue 5. B. e. ALL are TRUE (ii) Transparent outer layer that refracts light is lens. a. True b. 37-Which of the following is NOT a feature of the retina? Because the shape and thickness of lenses filters out a portion of the spectrum before it reaches the photoreceptors : c. Because eyes first evolved in water-dwelling animals and water filters out most of the spectrum : d. 21) Which of the following is a true statement? Note that the photoreceptors in the retina (rods and cones) are located behind the axons, RGCs, bipolar cells, and retinal blood vessels. C) Sodium channels are open. d. d. They undergo continuous turnover (die and are replaced). 91) Which of the following is true of photoreceptors in the light (relative to the dark)? They do not necessarily represent the quality of questions which will appear on the Unit evaluation. The retina consists of cells called _____ that are sensitive to light. Pathology. d. Thermoreceptors are activated by pressure. (b) A blowup shows the layers of the retina. a. My colleagues and I have begun to use DNA microarrays to determine the patterns of gene expression at consecutive stages of eye development. Set I b. Which of the following is true about photoreceptors? This design requires that light travel through the nerves and blood vessels in order to reach the photoreceptor cells which are located behind the eye’s wiring. All … the piece of the retina/photoreceptors that connects (indirectly) to the ganglion cell, or; the region of the visual field in which light stimuli evoke responses in the ganglion cell. Light entering the retina has to travel through several cell layers to reach the photoreceptors. When light hits photoreceptors, these special channels close. True False. This is where the photoreceptors are located. Rods absorb light throughout the … Photoreceptors are nerve cells which have been designed to be sensitive to light. Rods are associated with photopic vision. Clouding of the lens of the eye, which produces an opaque condition, causes: A.accommodation deficits B.cataracts C.glaucoma 21. MGT Review Test 3 [Chapter 7 & 10] In the context of a firm’s vertical structure, a powerful trend for U.S. businesses over the past few decades has been to: reduce the number of hierarchical layers. C) we can only see color, and not black and white. A) Three types of color-sensitive photoreceptors exist: red, green, and yellow. Acting similarly to a camera's aperture, it regulates the amount of light that enters the eye's interior. b. Epigenetic tags replace internal signals in driving physical growth after birth. d. Photoreceptors are nerve cells which have been designed to be sensitive to light. These cells are located in the eye, allowing an organism to see, and the process through which they work is complex and quite fascinating. There are three types of photoreceptors: rods, cones, and photosensitive ganglion cells,... es Cones are associated with color vision. Cones are a type of photoreceptors in the retina, which are responsible for the color vision at daylight. The stimulus energy must be converted into the energy … A) ganglion cells: B) photoreceptors… (starting with top half to bottom half) (from left to right) Stimulus, Receptors, control … c. a. high ratio of photoreceptors to ganglion cells . 36. Table 1 Characteristics summary (morphology, opsin, phototransduction cascade, and electrophysiology) of the transmuted photoreceptors of different species compared to true rods and true cones.. Lizard data are for the genus Anolis.Lamprey is the sea lamprey Petromyzon marinus.Salamander is the tiger salamander Ambystoma tigrinum.Pearlside is the Mueller’s pearlside … C. Color is a property of objects. photoreceptors in the outer retina. It is surrounded by the iris, which constricts and expands to change the size of the pupil. The Retina . Answer: Option C is correct Explanation: Photoreceptors are light-sensitive proteins found in various organisms.
c. rods are used in high light environments. Olaf Strauss. b. which of the following is true about gustatory receptors? A.rods B.cones 20. The pupil is a dark circle in the center of the eyeball. a. 15. Test out what you recall from chapter 10 on the sensory system by taking up the quiz below on the topic. a. Mechanoreceptors are activated by stimuli that “deform” the receptor. The sensory system is mainly made up of the organs that help in human sense. Therefore, the correct answer is option A. The point in the eye that allows light to pass almost directly at the photoreceptors and greatly enhances visual activity. 1. a. nephrons b. photoreceptors c. keratinocytes d. melanocytes ANSWER: b 17. A) is composed of about 1000 cells, in which the developmental origin of each cell has been mapped. B) Phosphodiesterase is more active.
b. cones are more numerous than rods in the eye. Nerves can carry only sensory information, only motor information, or a mixture of sensory and motor information. Rods detect color, while cones detect only shades of gray. B. False 47. The most sensitive part of the retina is a small area called the macula, which has millions of tightly packed photoreceptors (the type called cones).The high density of cones in the macula makes the visual image detailed, just as a high-resolution digital camera has more megapixels. ‘These developmental differences between autotrophs and parasites suggest that the functions of photoreceptors differ among autotrophs, hemiparasites, and holoparasites.’ ‘It is a true autotroph and uses only two sources for its metabolism: carbon dioxide as … The study of plant photoreceptors has a long history. Because of the evolutionary constraints on the development of photoreceptors in the eye : b. A. a. Both cell types appear in conjunction in every eye of the animal kingdom from insects, mollusca to higher vertebrates [1]. C) Guidelines for diabetics include an annual optometrist or ophthalmologist examination. e. Their … Identify a true statement about delegation. This condition results from an absence of color-sensitive pigment in the cone cells of the retina, the nerve layer at the back of the eye. Which of the following statements about fluids in the eye is TRUE? B) an organism's responding is influenced by the observation of others' behavior. The retina is the back part of the eye that contains the cells that respond to light. C) an organism engages in a response that brings aversive stimulation to an end. A) photoreceptors are much more sensitive to stimulation. This change causes an electrical signal which is sent to the brain via the optic nerve. a. Epigenetic tags are formed in the early life span, but deteriorate in old age. a. the constantly changing sensitivity of photoreceptors to light in order to match illumination levels. The retina consists only of rods and cones. Which of the following is NOT true about cones? These photoreceptors are of two kinds: rods and cones. Rod cells are photoreceptor cells in the retina of the eye that can function in less intense light than the other type of visual photoreceptor, cone cells. Rods are usually found concentrated at the outer edges of the retina and are used in peripheral vision. Most color-sensitive ganglion cells respond in a center-surround fashion. c. Retinal ganglion cell bodies are located in ganglia outside the eye. 2. A) It is the main place at which refraction of light occurs. Which of the following is TRUEregarding the diagram below of a normal retina? False. Q. There may be as many as a 1000 different olfactory receptor proteins. b. Questions 37-81, Nerve cells, true or false. This part protects the eye, especially the iris, pupil and lens. However, a fixed relationship between the two holds only for a fixed eye position. Cyclic GMP binds sodium channels, keeping them open leading to the depolarization of photoreceptor in light. Which of the following functions in black and white, dim light vision? Rods are most numerous in the periphery of the retina. In conditions of high ambient light, the iris contracts, reducing the size of the pupil at its center. Some ganglion cells serve as "black-and-white" detectors. Which of the following is not a true statement? The rods are most sensitive to light and dark changes, shape and movement and contain only one type of light-sensitive pigment. True b. Which of the following is NOT true about the cornea? Most color vision problems are inherited and are present at birth. Rods are a type of photoreceptor cell in the retina.They are sensitive to light levels and help give us good vision in low light. Photoreceptors in plants are involved in a variety of functions, such as growth, greening, and photosynthesis. The ___ attaches the lens. c. They have fine, myelinated axons. Check all that apply Check All That Apply Rods are responsible for night vision. Color-blindness is the inability to distinguish the differences between certain colors. Depth perception b. Retinal disparity c. A visual illusion d. An absolute threshold ANSWER: c 101. D) If all cones are stimulated equally, all colors are absorbed by the cones and the color perceived is black. The visual system comprises the sensory organ (the eye) and parts of the central nervous system (the retina containing photoreceptor cells, the optic nerve, the optic tract and the visual cortex) which gives organisms the sense of sight (the ability to detect and process visible light) as well as enabling the formation of several non-image photo response functions. b) Photoreceptors hyperpolarize to light. A) Horizontal cells transmit info from bipolar cells to neighboring ganglion cells. True b. Cones are not very sensitive to light. C) Rods absorb light throughout the visual spectrum but confer only gray tone vision. Photoreceptors: As the name suggests, photoreceptors are sensory receptors that respond to visible light (the term photo is derived from a Latin word that means light). (1 point) decreased blood flow increased dust and bacteria in the lungs Name (please print):_____KEY_____ Sign your name in the space provided below if you would like your grade to be posted by the last five digits of your social security number (sign here, don’t put your SS#) : _____. Hearing is attributed to auditory receptors. Which of the following is true about photoreceptors? Cones are less in number when compared to rods. Following these studies on single genes, I undertook a more global approach to decypher the entire eye morphogenetic pathway of Drosophila and eventually compare it to that of the mouse. frequency:loudness: The eye muscle that elevates and turns the eye laterally is the____ inferior oblique: which of the following is true about photoreceptors? Which part of the eye is this? Tonic receptors Which of the following statements is true? a).It is biconvex. B. This exam has 7 pages, 13 short answer/terminology questions and 30 multiple choice questions. c. the sensitization of photoreceptors to light levels that are constant. complete adaptation occurs in about one to five minutes: which pairing of terms is incorrectly related? Because the shape and thickness of lenses filters out a portion of the spectrum before it reaches the photoreceptors : c. Because eyes first evolved in water-dwelling animals and water filters out most of the spectrum : d. However, at the exact center of the retina is a small area known as the fovea. b. A. B) If all cones are stimulated equally, all colors are absorbed by the cones and the colorperceived is black. Which of the following statements regarding vertebrate olfactory receptor cells is true? E) cGMP levels are elevated. *** Bones are composed of a single layer. A significant amount of light is absorbed by these structures before the light reaches the photoreceptor cells. They are epithelial cells. The stimulus energy must occur within the receptor's receptive field. Rods are concentrated at the periphery and function well in dim light. c. Light hits and is absorbed by the first layer of cells called bipolar, and then the information is passed through other cells on the way to the rods and cones. C. Color is a property of objects. 28. Indeed, following the ground-breaking report of 3D stem cell differentiation, by Eiraku, Sasai and colleagues (Eiraku et al., 2011; Eiraku and Sasai, 2012), there has rapid development and widespread reporting of a variety of protocols to produce stem cell-derived mouse and human photoreceptors. Score 1 User: _____ enable humans to see and detect the color of different objects.Pain receptors Chemoreceptors Photoreceptors Mechanoreceptors Q. (iii) Retina is a light sensitive layer of the eye. Rods are 500 to 1,000 times more sensitive to light than cones.The retina has approximately 120 million rods and 6 million cones. Olfactory receptor cells which are present in very large numbers (millions) and are clusters within a small area in the back of the nasal cavity, forms an olfactory epithelium. 43. C. Humans have the most acute sense of smell of all the mammals. This is the gooey material that is clear and helps to give the eye its shape: Q. Different types of photoreceptor allow us to see in a huge range of different conditions, from dark to light, and all the colours of the rainbow. A.cones detect color of an object B.cones detect detail of an object True b. Match the following sensory receptors to the stimuli they detect. B) has only a single chromosome, which has been fully sequenced. With the advent of modern molecular biology, the genes encoding these plant photoreceptors have been identified and cloned. a).ganglion cells b).photoreceptors c).optic chiasma d).optic disc c). Upgrade and get a lot more done! Questions 1-36, Nerve cells, multiple choice. Which of the following statements regarding color perception is true? Instructor: John Godwin, Fall 1998. Rods are concentrated in the fovea of the retina and function well in dim light. Name (please print):_____KEY_____ Sign your name in the space provided below if you would like your grade to be posted by the last five digits of your social security number (sign here, don’t put your SS#) : _____. Which of these symptoms might the patient experience? Which of the following descriptions of photoreceptors in the eye is NOT correct? Degeneration of photoreceptors, the major light-sensing cells in the eye, is a primary cause of vision loss worldwide. Skip to main content Accessibility help We use cookies to distinguish you from other users and to provide you with a … (iv) Cornea is a region without any sensory cells. mechanoreceptors thermoreceptors photoreceptors chemoreceptors nociceptors. Color perception depends on our photoreceptors, our brains, and the physical characteristics of the stimulus we look at. In the center of the eye, then, where the photoreceptors are packed densely, the cone photoreceptors are tightly packed and their centers are separated by one-half minute of visual angle. d. the abundance of blood vessels to nourish this metabolically active area . Instructor: John Godwin, Fall 1998. Which of the following statements regarding color perception is true? rods absorb light throughout the visual spectrum but confer only gray tone vision D) uniquely, among animals, utilizes programmed cell death during normal development. (B) analyze the same kind of information from the visual field. NOTE: The following questions are designed for introductory drill. Color perception depends on our photoreceptors, our brains, and the physical characteristics of the stimulus we look at. (1 point) Bones are organ systems. Summary. Consider the following statements and select the option which correctly identifies true (T) and false (F). The photoreceptors and the statocytes are sense organs present only in medusa and lacking in the polyp. B) Some photoreceptors depolarize in the dark and some depolarize in the light. A) Rods absorb light throughout the visual spectrum but confer only gray tone vision. What is Color-Blindness. Which of the following structures is NOT a part of the peripheral nervous system (PNS)? The spectrum of color visible to humans ranges from 550 nm to 950 nm. The cones mediate most accurate vision. User: All of the following are considered stress hormones except _____.A. Taste and smell are examples of chemoreceptors. Humans can distinguish up to 10,000 different odors. Which of the following terms denotes a trick of perceptual constancies on the eye? There are more cones than rods Cones function in brighter light. These specialized cells are called photoreceptors.There are 2 types of photoreceptors in the retina: rods and cones. True b. E) All of the above are true. The parvocellular and magnocellular layers of the dorsal lateral geniculate nucleus... (A) may belong to different visual systems. Activated rhodopsin activates transducin which deactivates cGMP phosphodiesterase.c. C) It is nourished by the vitreous humor. Operant conditioning is a type of learning in which: A) voluntary responses come to be controlled by their consequences. Photoreceptors in the retina are of two types: rods and cones. True color blindness, or the inability to see any color, is extremely rare, although as many as 8 percent of men and 0.5 percent of women are born with some form of color vision defect (see Table 1). A) In dim light, images are focused directly on the rods in the fovea centralis.
d. each rod is connected with only one bipolar cell and one ganglia cell. Chapter 6 - The Visual System Quiz 1. C) has about 1000 genes, each of which has been fully sequenced. Correct each statement to make it true:-a. Activation of rhodopsin depolarizes photoreceptors.b. Eye color is determined by that of the iris. a. False 44. The rods and cones are the photoreceptors. Daniel Organisciak, Marco Zarbin, in Ocular Disease, 2010. Sclera: The sclera is the white part of the eye, and covers most of the eye surface. Which of the following is true of negative feedback mechanisms? C) Three types of color-sensitive photoreceptors exist: red, green, and yellow. Some visual cell dropout occurs naturally as a result of aging, but rod and cone survival into the seventh decade and beyond is normally more than sufficient to preserve vision.
a. rods absorb light throughout the visual spectrum but confer only gray tone vision. The stimulus energy must match the specificity of the receptor. d) None of the above is true 17) Photoreceptors in the retina have special channels that are open to Na+ in the dark. This exam has 7 pages, 13 short answer/terminology questions and 30 multiple choice questions. Each of the following statements is false. A patient has a disease that affects the capillaries. Answers: 1, question: Which of the following is true about photoreceptors? a. D) … CNS nerve fibers regenerate because of the actions of Schwann cells. Which of the following is a true statement regarding photoreceptors? d. The retina consists of rods and cones, the basilar membrane, the sclera, and … 1. Steps in phototransduction along the photoreceptor cell membrane:\Step 1: Light activates rhodopsin.\Step 2: Activated rhodopsin activates transducin (a G-protein).\Step 3: Transducin activates phosphodiesterase (PDE).\Step 4: The transducin/PDE combination converts cGMP to GMP.\Step 5: … Cone photoreceptors on the other hand function under bright light, conveying luminance and color information. Which of the following statements about the eye is/are TRUE? Select one: a. D. TRUE E. FALSE the shape of the lens is under neural control 2. A. Tunica fibrosa refers to the outer fibrous layer of the eye. Photoreceptor cells are differentiated postmitotic retinal neurons that normally function throughout the life of an individual. 38-Which of the following statements about the lens is NOT true? The iris adjusts the amount of light coming into the eye. These cells are located in the eye, allowing an organism to see, and the process through which they work is complex and quite fascinating. 35) Which of the following statements concerning the retina is NOT true: a. c. all of the photoreceptors here are rods, which are more resistant to photobleaching . Q. Bones help the heart pump blood. You can see in the drawing on the left that the back of the eye is lined with a thin layer called the retina. c. Cones are concentrated in the fovea of the retina and function to detect colours. D) A. The vitreous humor is a fluid contained in the anterior segment of the eye. C. Photoreceptors D. Phasic receptors B. epinephrine B. cortisol C. norepinephrine D. estrogen Weegy: All of the following are considered stress hormones except Estrogen. b. FALSE The vitreous is a transparent, colorless mass of soft, gelatinous material The PROCESS OF INQUIRY used in the Eye and its Connections activities will help students reach the following summarized Benchmarks: 1A, 6-8, #1 When similar investigations give different results, the scientific challenge is to judge whether the differences are trivial or significant, and it often takes further studies to decide. False 45. Olfactory receptor plays a central role in the sense of smell. D. All of the choices are correct. b. lateral displacement of the ganglion cells from the retina . B) Three types of color-sensitive photoreceptors exist: red, green, and yellow. Abstract. False 46. Which of the following is an accurate statement? light approaches the photoreceptors from the bottom of the figure: Bis a bipolar cell: the outer segment of cell Cis supplied by the central retinal artery: the part of the axon that is shown for cell Ais myelinated: two of the above statements are correct Photoreceptors contain special chemicals which change when light hits them. Drag the appropriate labels to their respective targets. It is often claimed that the human retina is poorly designed because it appears to be placed in the eye backwards. Rod photoreceptors are charac-terized by higher light sensitivity and slower kinetics, mainly mediatingmonochromaticlow-lightvision[191,50,57,105]. (a) The human eye is shown in cross section. Their axons reside in the mucous layer. a. The resulting signal is zapped along the optic nerve to the visual cortex of the brain, which processes the information and returns with a color: yellow. We have five sensory organs, which include the ears, tongue, skin, nose and eyes and they have receptors that relay information through sensory neurons to the appropriate places within the nervous system. ‘Furthermore, extraretinal photoreceptors appear to be involved in the photic entrainment of the circadian clock.’ ‘They are therefore true deep-brain photoreceptors that bypass the eyes as a pathway for photic information.’ ‘The implications of this work on thought about evolution of photic behavior in fireflies are considered.’ The … Which of the following is false regardingretinopathy: A) Carcinoma-associated retinopathy is characterized by slow onset of blindness caused by retinal degeneration, usually of photoreceptors. B) The most common cause of retinopathy is diabetes mellitus. The effects of neurotransmitters released from either sympathetic or parasympathetic postganglionic neurons may be stimulatory or inhibitory. 91) A) The synaptic terminal is releasing more transmitter. Group of answer choices Parasympathetic (sympathetic) innervation of the sphincter pupillae stimulates pupil dilation. Which of the following is true regarding phototransduction along the photoreceptor cell membrane? In conditions of low light, the iris relaxes and the pupil enlarges. A. If all cones are stimulated equally, all colors are absorbed by the cones and the color perceived is black In dim light, images are focused directly on the rods in the fovea centralis Rods absorb light throughout the visual spectrum but confer only gray tone vision Three types of color … They are concentrated in the outer areas of the retina and give us peripheral vision. The retinal pigment epithelium by Olaf Strauss. B) In dim light, images are focused directly on the rods in the fovea centralis. D) The photoreceptors are depolarized. Ex: view the full answer Cone cells, or cones, are one of the two types of photoreceptor cells that are in the retina of the eye which are responsible for color vision as well as eye color sensitivity; they function best in relatively bright light, as opposed to rod cells that work better in dim light. The spectrum of color visible to humans ranges from 550 nm to 950 nm. Figure 17.17. The simplest light detecting organs are composed of two cell types: the light sensitive photoreceptor cell and the pigmented cell. The optic nerve carries signals indicating color, brightness, and motion from the retina to a relay center in the mid-brain called the thalamus. The tunics of the eye consist of the following three layers: Tunica fibrosa. FALSE the cells of the retina are not in contact with the aqueous humor but are in contact with the vitreous humor B. The retina contains the cells that sense light (photoreceptors) and the blood vessels that nourish them. Q. 20. Experiments performed over 120 years ago first determined that different wavelengths of light could elicit different growth responses in plants. B. The output shuts off the original stimulus or reduces its intensity 3. Introduction. (i) Part that gives colour to the eye is iris. Rods and Cones of the Human Eye The anatomy of the human eye. 19. D) It is avascular. Which of the following is true about photoreceptors? A. About 6 million cones can be identified in the retina. Click to enlarge and for more information. Exam 3 - Zoology 250 Version A KEY. Reproduction of polyp and medusa; Polyp reproduction can be asexual by budding through the evagination of a circular are of tissue including the endoderm and ectoderm, or sexual by spawning following the release of pheromones. b. the capacity of many photoreceptor cells to send signals to a single cell. It is also known as the colored part of the eye. Choose the FALSE statement about nerves. The visual pathway is the network of nerves that convey the light striking the eyes into the brain in the form of chemical and electrical information. 37: Which of the following is NOT a feature of the retina? After entering the pupil, that light passes through the … A generator potential in the associated sensory neuron must reach threshold. The fovea is the region of highest visual resolution. This leads to the following equation: (1) The width of a cone in degrees of visual angle, , is approximately degrees, or roughly one-half minute of visual angle. Greg Caramenico The thalamus in the mid-brain is where all visual information is sorted. This includes the sclera and the cornea, which are continuous with one another. B) It is transparent. Which statement is true? Bones provide shape to the body. (See " Look Inside the Eye. ")
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