Functions of the pigment epithelium of the retina do NOT include ________.
A. stabilize ion composition surrounding the photoreceptors
B. absorption of scattered light
C. delivery of nutrients to the photoreceptors
D. creating the dark current of the photoreceptors
Answer: D
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Color vision has much greater resolution than night vision (vision that is mostly in shades of gray). Which of the following is the best explanation for why this is so?
A) A single cone photoreceptor often connects to a single bipolar cell and a single ganglion cell while as many as 100 rods will converge to a single ganglion cell. B) There are many more cone photoreceptors in the eye than rod photoreceptors. C) There are several types of cone photoreceptors, each of which enrich the clarity and resolution of vision. D) A larger proportion of the brain's visual cortex is active during the day when our cone photo receptors are most active.
The glomerulus is:
a. part of the renal tubules b. a network of blood capillaries c. the cup-shaped top part of the nephron d. both A and B above
What type of proteins are present in gap junctions that form water-filled channels between neurons?
A. Connexins B. Myelin C. Cell adhesion molecules (CAMs) D. Terminal boutons
Glucagon does NOT ________.
A. promote the movement of glucose out of skeletal muscle cells B. promote lipolysis and ketogenesis C. raises blood glucose levels D. stimulates glycogenolysis and gluconeogenesis in the liver