Test 20 (ocular physiology)
1. The retinal pigment epithelium (RPE):
a. is sensitive to hypervitaminosis A

b. isomerizes all-trans-retinal to 11-cis-retinol

c. does not undergo mitosis in response to injury

d. secrets the outer layer of the basal lamina that forms the Bruch's membrane.

e. has multiple apical villi into which the outer segment of the photoreceptor 
    outer segments are embedded.

2. The following are found in higher concentration in the tear than in the serum:
a. sodium

b. potassium

c. Ig G

d. glucose

e. chloride


3. The corneal stroma:
a. measures 500 um thick

b. transmits 90% of the incoming light

c. derives most of its oxygen from the precorneal tear film

d. is acellular which accounts for its transparency

e. contains collagen fibrils which forms obliquely oriented lamellae in the 
    posterior third of the cornea

4. The following proteins found in the tear of a normal person have antibacterial activity:

a. lysozyme

b. lymphokines

c. betalysin

d. immunoglobulin M

e. lactoferrin

5. The following are true about electro-retinography?

a. flicker ERG can be used to test cone function

b. ERG is normal in patient with macular degeneration

c. the a-wave of ERG is produced by the ganglion cells

d. the b-wave is produced by the photoreceptor cells

e. c-wave is produced by the RPE cells

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