vision - anp 1106 UPDATED ACTUAL
Questions and CORRECT Answers
Q: What are the three tunics of the eye? - CORRECT ANSWER - Fibrous tunic, vascular tunic, and
neural tunic
What structures make up the fibrous tunic of the eye? - CORRECT ANSWER - Sclera and cornea
What structures make up the vascular tunic (uvea) - CORRECT ANSWER - Choroid, ciliary body,
and iris
What structure forms the neural tunic of the eye? - CORRECT ANSWER - Retina
What are the two layers of the retina? - CORRECT ANSWER - Pigmented layer and neural layer
What cells are found in the retinal pigmented epithelium? - CORRECT ANSWER - pigmented
epithelial cells
What is the function of the pigmented layer? - CORRECT ANSWER - Absorbs light and prevents
scattering
What cells are found in the neural layer of the retina? - CORRECT ANSWER - Photoreceptors,
bipolar cells, ganglion cells, horizontal cells, and amacrine cells
What are the two types of photoreceptors? - CORRECT ANSWER - Rods and cones
Which photoreceptors are responsible for night vision? - CORRECT ANSWER - rods
Which photoreceptors are responsible for color vision? - CORRECT ANSWER - cones
, Which photoreceptors provide high visual acuity? - CORRECT ANSWER - cones
Which photoreceptors are more sensitive to light? - CORRECT ANSWER - Rods
What pigment is found in rods?
What molecule does it consist of? - CORRECT ANSWER - rhodopsin
Opsin protein and retinal
What happens to rhodopsin when exposed to light? - CORRECT ANSWER - Retinal changes shape
(isomerization)
What process occurs when rhodopsin breaks down in light? - CORRECT ANSWER -
Photobleaching
What pigments are found in cones? - CORRECT ANSWER - Photopsins
What are the three cone types? - CORRECT ANSWER - red, blue, green
What determines the color perceived by the brain? - CORRECT ANSWER - Relative activation of
different cone types
What is phototransduction? - CORRECT ANSWER - Conversion of light into electrical signals
What happens to photoreceptors in darkness? - CORRECT ANSWER - They are depolarized
What ion channels are open in darkness in photoreceptors? - CORRECT ANSWER - Na⁺ channels
Questions and CORRECT Answers
Q: What are the three tunics of the eye? - CORRECT ANSWER - Fibrous tunic, vascular tunic, and
neural tunic
What structures make up the fibrous tunic of the eye? - CORRECT ANSWER - Sclera and cornea
What structures make up the vascular tunic (uvea) - CORRECT ANSWER - Choroid, ciliary body,
and iris
What structure forms the neural tunic of the eye? - CORRECT ANSWER - Retina
What are the two layers of the retina? - CORRECT ANSWER - Pigmented layer and neural layer
What cells are found in the retinal pigmented epithelium? - CORRECT ANSWER - pigmented
epithelial cells
What is the function of the pigmented layer? - CORRECT ANSWER - Absorbs light and prevents
scattering
What cells are found in the neural layer of the retina? - CORRECT ANSWER - Photoreceptors,
bipolar cells, ganglion cells, horizontal cells, and amacrine cells
What are the two types of photoreceptors? - CORRECT ANSWER - Rods and cones
Which photoreceptors are responsible for night vision? - CORRECT ANSWER - rods
Which photoreceptors are responsible for color vision? - CORRECT ANSWER - cones
, Which photoreceptors provide high visual acuity? - CORRECT ANSWER - cones
Which photoreceptors are more sensitive to light? - CORRECT ANSWER - Rods
What pigment is found in rods?
What molecule does it consist of? - CORRECT ANSWER - rhodopsin
Opsin protein and retinal
What happens to rhodopsin when exposed to light? - CORRECT ANSWER - Retinal changes shape
(isomerization)
What process occurs when rhodopsin breaks down in light? - CORRECT ANSWER -
Photobleaching
What pigments are found in cones? - CORRECT ANSWER - Photopsins
What are the three cone types? - CORRECT ANSWER - red, blue, green
What determines the color perceived by the brain? - CORRECT ANSWER - Relative activation of
different cone types
What is phototransduction? - CORRECT ANSWER - Conversion of light into electrical signals
What happens to photoreceptors in darkness? - CORRECT ANSWER - They are depolarized
What ion channels are open in darkness in photoreceptors? - CORRECT ANSWER - Na⁺ channels
