Which of the following occurs when the product of a metabolic pathway binds to an enzyme and decreases enzymatic activity?
A. Allosteric inhibition
B. Second messaging
C. Coupling
D. End-product therapy
Answer: A
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Which of the following statements concerning the vagina is false?
A) It serves as a passageway for the elimination of menstrual fluids. B) It receives the penis during sexual intercourse. C) It holds sperm prior to their passage to the uterus. D) It forms the lower portion of the birth canal. E) It loses a portion of its lining during menses.
Airway resistance
a. is normally the primary factor determining the amount of flow into/out of the lungs. b. is increased when the diameter of the airways becomes reduced. c. when elevated requires an increased pressure gradient between the lungs and atmosphere through vigorous respiratory efforts to move even normal volumes of air into and out of the lungs. d. both (b) and (c) above. e. all of these answers.
In the inflammatory response, clotting proteins form a clot. This action
A. produces edema. B. walls off foreign particles and microbes. C. increases the permeability of blood vessels. D. phagocytizes microbes. E. stimulates pain receptors.
When a muscle fiber is subjected to a stimulus, it contracts completely. This is called:
a. threshold stimulus b. the all-or-none-law c. twitch contraction d. tetanic contraction