In the positive feedback mechanism governing breastfeeding, the mammary glands of the breast serve as the
A. effector.
B. set point.
C. control center.
D. receptor.
Answer: A
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Which of the following explain how physical activity can increase cellular sensitivity to insulin?
A. Continuous production of insulin leads to a priming effect on the cells B. Pulsatile secretion of insulin during the activity leads to upregulation C. Desensitization of the glucagon receptors, increases the sensitivity of the cells to insulin D. Upregulation of GLUT4 receptors
The mechanism for producing concentrated urine involves all of the following except
A) the secretion of antidiuretic hormone (ADH). B) aquaporins being inserted into the membranes of the collecting duct cells. C) a high concentration of NaCl in the fluid surrounding the collecting ducts. D) a properly functioning nephron loop. E) the release of natriuretic peptides.
Fibers of muscles whose motor neurons are severed
A) cannot ever be reinnervated. B) may be replaced by fat or fibrous connective tissue. C) hypertrophy. D) die as their sarcomeres are progressively eliminated.
Which pattern of hormone secretion, represented by epinephrine, can have dramatic changes in its concentration and circulating levels?
A. chronic hormone secretion B. long-term hormone secretion C. episodic hormone secretion D. acute hormone secretion