ANAT & PHYS 337 - Visual System (Chapter 18.6 Mastering)

Match the description with the correct type of photoreceptor. Rods Cones a) Capable of detecting different colors b) Most concentrated around the periphery of the retina c) Allow us to see in very dim light d) Highly light-sensitive e) Give us sharper, clearer images f) Most concentrated at the center of the retina (macula)

Cones: a) Capable of detecting different colors e) Give us sharper, clearer images f) Most concentrated at the center of the retina (macula) Rods: b) Most concentrated around the periphery of the retina c) Allow us to see in very dim light d) Highly light-sensitive

Match the portion of the retina with the correct descriptions. -Pigmented layer -Neural layer a) Absorbs light b) Has important biochemical interactions with photoreceptors c) Contains blood vessels that supply tissues of the inner layer. d) Contains supporting cells and neurons that perform the first steps in processing and integrating visual information e) Contains photoreceptors

Pigmented layer: a) Absorbs light b) Has important biochemical interactions with photoreceptors Neural layer: c) Contains blood vessels that supply tissues of the inner layer. d) Contains supporting cells and neurons that perform the first steps in processing and integrating visual information e) Contains photoreceptors

Which of the following functions listed below is the fibrous tunic of the eye NOT responsible for? a) photoreception b) providing a passageway for blood vessels c) muscle attachment d) maintaining eye shape

a) photoreception

Why do you have a blind spot in each eye? a) The area receives no oxygen supply from blood vessels and therefore cannot support living cells such as rods and cones. b) The axons of the ganglion cells converge in one spot to form the optic nerve. c) The pigment epithelium is so dark in the blind spot that light cannot be perceived. d) You have an abundance of bipolar cells in one area of each retina that collect the information from all the rods and cones.

b) The axons of the ganglion cells converge in one spot to form the optic nerve.

In the eye, axons from ganglion cells converge on the ________. a) macula b) optic disc c) vitreous body d) choroid e) fovea

b) optic disc

Light information passes completely through the retina before being absorbed and converted into a neural signal. Which of the following answers has the pathway of light information through the retina in the correct order? a) Photoreceptors --> Bipolar Cells --> Retinal Ganglion Cells --> Pigmented Layer b) Photoreceptors --> Pigmented Layer --> Retinal Ganglion Cells --> Bipolar Cells c) Pigmented Layer --> Bipolar Cells --> Retinal Ganglion Cells --> Photoreceptors d) Pigmented Layer --> Photoreceptors --> Bipolar Cells --> Retinal Ganglion Cells e) Pigmented Layer --> Photoreceptors --> Retinal Ganglion Cells --> Bipolar Cells

d) Pigmented Layer --> Photoreceptors --> Bipolar Cells --> Retinal Ganglion Cells

The _______________ is located at the center of your answer from part A, and it is the site of sharpest color vision.

fovea centralis

The ____________ is a region of the retina where the visual image arrives after it passes through the cornea and lens. It contains no rods.

macula

Which of the following are true regarding the cornea? ⬜ Its superficial cells obtain oxygen and nutrients from tears. ⬜ It is highly vascular. ⬜ It is continuous with the sclera. ⬜ It has many free nerve endings, making it very sensitive to pain. ⬜ It is covered by a thin layer of simple cuboidal epithelium.

⬜ Its superficial cells obtain oxygen and nutrients from tears. ⬜ It is continuous with the sclera. ⬜ It has many free nerve endings, making it very sensitive to pain.