When triggered by changes in the blood pressure, the juxtaglomerular cells release:
A) renin.
B) aldosterone.
C) angiotensin I.
D) angiotensinogen.
Ans: A) renin.
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The connective tissue covering of an entire nerve is called the __________.
Fill in the blank(s) with the appropriate word(s).
Which of the following is true on the island of Mangaia?
A. Premarital sex is essentially unknown. B. Three orgasms per night are common in middle age. C. Foreplay is limited to kissing and fondling of the buttocks. D. Boys learn about cunnilingus from male experts.
The tissues of the central nervous system:
A) can metabolize fat and proteins to make energy. B) are able to store glucose and use just what is needed. C) can only survive for about an hour without glucose. D) depend entirely on glucose as their source of energy.
Which of the following statements about the phases of a neuronal action potential is TRUE?
A. During the after-hyperpolarization phase, the permeability of the membrane to sodium ions is greater than its permeability to potassium ions. B. During the after-hyperpolarization phase, the permeability of the membrane to potassium ions is greater than its permeability at rest. C. During the repolarizing phase, the permeability of the membrane to sodium ions is greater than its permeability to potassium ions. D. Potassium channels inactivate during the depolarization phase. E. Repolarizing to negative membrane potentials causes the sodium channels to inactivate.