The relative refractory period occurs after the action potential is complete because of
a. the lingering inactivation of the voltage-gated Na+ channels
b. the slowness of the voltage-gated K+ channels
c. the action of the sodium-potassium pumps
d. both a and b
e. both b and c
D
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When B and T cells are fully developed and mature, they are described as being
a) Immunocompetent b) Pluripotent stem cells c) Primary lymphatic cells d) Specifically promoted e) Germ cells
Which of the following secretes pepsinogen, which in turn initiates protein digestion?
a. chief cells b. mucous cells c. parietal cells d. G cells
A fetus undergoes its largest absolute weight gain during which trimester?
A) first trimester B) second trimester C) third trimester
The friction blood encounters as it flows through the vessels is called ________
A) cardiac output B) stroke volume C) peripheral resistance D) blood pressure E) diastolic pressure