A deficiency of hormone results in an increase in the number of receptors for that hormone. This is known as _____ and results in _____.
A) Negative feedback. Increased response to the hormone.
B) Down-regulation. Decreased sensitivity to the hormone.
C) Positive feedback. Decreased response to the hormone.
D) Up-regulation. Increased sensitivity to the hormone.
Answer: D) Up-regulation. Increased sensitivity to the hormone.
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A drug that inhibits angiotensin converting enzyme (ACE) may lead to all of the following except
A) less secretion of aldosterone. B) increased urinary loss of sodium. C) reduction of blood pressure. D) decreased sodium reabsorption. E) increased fluid retention.
Which muscle or group is responsible for adduction of the toes?
A. Adductor hallucis B. Flexor hallucis brevis C. Plantar interossei D. Dorsal interossei E. Quadratus plantae
What structure does "C" represent on the diagram of the plasma membrane?
A. Integral protein B. Phospholipid bilayer C. Peripheral protein D. Membrane channel protein E. Internal membrane surface
Which of the following best describes the cerebral arterial circle (circle of Willis)?
A. Formed by the superior and inferior sagittal sinuses B. An anastomosis circling the entire cortex C. An anastomosis surrounding the pituitary gland D. A portal system connecting the hypothalamus with the anterior pituitary E. A short anastomosis found in the cerebellum