If a person is injected with a toxin that blocks acetylcholine receptors, which of the following will occur?
A. The toxin will have no effect on muscle action.
B. The sarcolemma will be constantly stimulated, and muscles will continually contract.
C. Spastic paralysis will result.
D. Stimulation of the sarcolemma will not be possible, and muscles will be paralyzed.
E. The person will develop myasthenia gravis.
Answer: D
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When blood Ca2+ levels fall below normal, in what ways do the kidneys help restore them toward normal?
A. By decreasing 1,25-dihydroxyvitamin D3 formation, increasing tubular phosphate reabsorption, and increasing tubular Ca2+ reabsorption B. By increasing 1,25-dihydroxyvitamin D3 formation, decreasing tubular phosphate reabsorption, and increasing tubular Ca2+ reabsorption C. By increasing 1,25-dihydroxyvitamin D3 formation, increasing tubular phosphate reabsorption, and increasing tubular Ca2+ reabsorption D. By increasing renal secretion of parathyroid hormone and increasing bone resorption E. Increasing 1,25-dihydroxyvitamin D3 formation and increasing secretion of parathyroid hormone
Sebaceous glands secrete
A. sweat. B. cerumen. C. sebum. D. breast milk.
The killing of cancerous cells by the immune system is called
A. hemostasis. B. phagocytosis. C. immune surveillance. D. immune oversight. E. tissue immunity.
Which cells are commonly found wedged between simple columnar epithelial cells?
A) mast cells B) goblet cells C) fibroblasts D) macrophages