What neurohormones are released from the adrenal medulla?
A) corticosteroids B) glucocorticoids
C) catecholamines D) androgenic steroids
Answer: C
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In an endergonic reaction,
A) large molecules are broken down into smaller ones. B) small molecules are assembled into larger ones. C) molecules are rearranged to form new molecules. D) molecules move from reactants to products and back. E) energy is consumed during the reaction.
Which of the following is not involved in the relaxation of muscle?
a. when acetylcholine is destroyed by acetylcholinesterase. b. when there is no longer a local action potential. c. when the T tubules actively take up the Ca2+ that had been released. d. when the actin and myosin molecules are no longer bound together. e. when the troponin-tropomyosin complex slips back into its blocking position.
Which of the following is not a reason muscular weakness tends to develop in old age?
A. There are fewer and smaller mitochondria in aged muscle. B. Aged muscle has less glycogen, myoglobin, and creatine phosphate. C. The muscle fibers of aged muscle no longer synthesize myosin. D. Aged muscle fibers have fewer myofibrils. E. There are fewer motor neurons in the spinal cord.
Color vision
A. is a function of cone cells. B. is most acute in dim light. C. is interpreted in the cerebellum. D. depends on the amount of available rhodopsin. E. is the interaction between rods and cones.