When a person rises quickly from a lying position, there is
A. an increase in vasomotor sympathetic stimulation to the blood vessels causing vasoconstriction.
B. reflexive slowing of the heart.
C. an increase of parasympathetic stimulation of the heart.
D. a decrease in heart rate and stroke volume.
E. an increase in the frequency of action potentials produced by the baroreceptors.
Answer: A
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Spinal interneurons prevent muscle antagonists from interfering with an intended movement by
A) activating reverberating circuits. B) initiating a tendon reflex. C) initiating a crossed extensor reflex. D) the process of reciprocal inhibition. E) initiating a stretch reflex.
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Indicate whether the statement is true or false.
The membrane on the surface of a lung is called the
A) parietal pericardium. B) parietal pleura. C) visceral pleura. D) visceral pericardium.