For the following questions, match the type of modulator with the best description below.
1. irreversible antagonist
2. covalent modulator
3. competitive inhibitor
4. allosteric modulator
A. involved in phosphorylation
B. cannot be displaced by competition
C. bind to proteins away from the active site
D. reversible antagonist
1. B. cannot be displaced by competition
2. A. involved in phosphorylation
3. D. reversible antagonist
4. C. bind to proteins away from the active site
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Which would NOT be caused by a decrease in plasma Ca2+ levels in an otherwise normal person?
A. An increase in bone density B. A decrease in the filtered load of Ca2+ C. An increase in plasma 1,25-dihydroxyvitamin D3 levels D. An increase in plasma parathyroid hormone levels E. An increase in nerve and muscle excitability
All of the following changes are commonly observed in the cardiovascular system in response to aging EXCEPT
a) decreased cardiac output. b) increased compliance of the aorta. c) loss of cardiac muscle strength. d) decline in maximum heart rate. e) increased systolic blood pressure.
Which of the following is a skin receptor for light touch, movement, and vibration?
A) free nerve endings B) lamellated corpuscles C) Pacinian corpuscles D) tactile
The adrenergic fibers innervating arterioles are __________ fibers that release __________ and cause __________.
a. sympathetic; epinephrine; vasodilation b. sympathetic; norepinephrine; vasoconstriction c. parasympathetic; norepinephrine; vasodilation d. parasympathetic; epinephrine; vasoconstriction