A depolarizing graded potential
a) makes the membrane more polarized.
b) makes the membrane less polarized.
c) is considered a type of action potential.
d) is the last part of an action potential.
e) is seen when the cell approaches threshold.
b
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Indicate whether the statement is true or false
In general, autonomic tone of peripheral blood vessels increases when
A) sympathetic stimulation is increased. B) sympathetic stimulation is decreased. C) parasympathetic stimulation is increased. D) parasympathetic stimulation is decreased. E) somatomotor stimulation is increased.
________ equals the respiratory rate × (tidal volume - anatomic dead space)
A) Vital capacity B) Respiratory minute volume C) Pulmonary ventilation rate D) Alveolar ventilation rate E) External respiration rate
Which of the following statements concerning blood vessel walls is true?
A. The tunica adventitia is composed of smooth muscle and endothelium. B. Capillaries have both a tunica intima and a tunica media. C. The tunica intima is the innermost layer of a blood vessel wall. D. The tunica media is found in all blood vessels except veins. E. Vessel diameter is controlled primarily by the tunica intima.