The elastic epithelial fold of variable size, which partially blocks the entrance to the vagina, is called the
A) fornix.
B) clitoris.
C) vestibule.
D) hymen.
E) labia minora.
D) hymen.
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Why is it necessary for gametes to be produced through a special process of cell division?
A. The cells that are produced must be genetically identical to the original cell. B. The cells that are produced must have twice as much genetic material as the original cell. C. The cells that are produced must have 23 chromosomes. D. The cells that are produced must have 46 chromosomes. E. The cells that are produced must have 92 chromosomes.
Reflexes can be:
a. a single neuron b. two neurons c. three neurons d. both B and C above
Which of the following does not bring about increased airway resistance?
a. asthma. b. epinephrine. c. slow-reactive substance of anaphylaxis. d. emphysema. e. excess mucus production.
Which of the following statements is TRUE concerning depolarization of a SA nodal cell?
a. The cell will not depolarize until it receives sympathetic stimulation b. The pacemaker potential is caused by Ca2+ entering the cell via L-type Ca2+ channels. c. The pacemaker potential is slower in achieving threshold when acetylcholine is applied to the SA node cells. d. During depolarization there is a gradually increasing permeability to K+. e. The slope of the depolarization is decreased when norepinephrine is applied to the SA node cells