Electrical synapses are more common than chemical synapses in the human nervous system
a. True
b. False
Indicate whether the statement is true or false
False
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If a person is injected with a toxin that blocks acetylcholine receptors, which of the following will occur?
A. The sarcolemma will be constantly stimulated and muscles will continually contract. B. Spastic paralysis will result. C. The toxin will have no effect on muscle action. D. Stimulation of the sarcolemma will not be possible and muscles will be paralyzed. E. The person will develop myasthenia gravis.
In performing its enzymatic function, carbonic anhydrase
A. requires the inorganic coenzyme zinc. B. requires the organic coenzyme carbon dioxide. C. is facilitated by the inorganic coenzyme NAD+. D. is facilitated by the organic coenzyme zinc. E. requires the inorganic coenzyme NADPH.
One way in which gametogenesis differs between the two sexes is that in spermatogenesis,
A) The mature gametes lack mobility. B) Four viable haploid gametes are produced from one germ cell. C) Chromosome number is halved only after the second meiotic division. D) The germ cells are diploid.
Which of the following is controlled by the somatic motor division?
A) cardiac muscle B) glands C) smooth muscle D) skeletal muscle