The aggregation of crystallin proteins in the lens produces ________.
A. myopia
B. cataracts
C. glaucoma
D. astigmatism
Answer: B
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Which cranial nerve is composed of only motor fibers?
A. VIII B. VI C. V D. IX E. I
Which of these blood hormone levels reaches its maximum during the luteal phase?
A. Estradiol B. FSH C. Progesterone D. LH E. GnRH
Autonomic tone is an important aspect of ANS function because it
A) allows ANS neurons to be silent under normal conditions. B) allows ANS neurons to increase activity on demand but not decrease their activity. C) allows ANS neurons to decrease their activity on demand but not increase their activity. D) allows ANS neurons to increase or decrease their activity, providing a range of control options. E) provides for a narrow range of control options that keeps target tissues constantly active.
The opening of more and more Na+ channels during depolarization
A. is an example of a positive feedback cycle. B. is the cause of the afterpotential. C. is the result of the sodium-potassium exchange pump. D. is an example of a negative feedback cycle. E. is possible only if K+ channels remain closed.