What physiological process occurs in the structure labeled "7"?
A) release of neurotransmitter
B) conduction of the action potential into the cell interior
C) activity of acetylcholinesterase
D) release of protein and calcium ions into the muscle fiber
E) opening of sodium channels and subsequent influx of sodium
B) conduction of the action potential into the cell interior
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____________________ refers to the body's ability to resist or eliminate potentially harmful foreign materials or abnormal cells
Fill in the blank(s) with correct word
Which of the following does progesterone INHIBIT during pregnancy?
A. the sensitivity of the myometrium to stimuli that promote contraction B. plugging of the uterus by thickened cervical mucus C. growth of the mammary glands D. secretion of estrogen E. regression of the corpus luteum
Helper T-lymphocytes are also known as
A. memory T-lymphocytes. B. CD8+ cells. C. T8 cells. D. cytotoxic T-lymphocytes. E. CD4+ cells.
The right ventricle is associated exclusively with which of the following?
A) pulmonary trunk B) aorta C) papillary muscles D) trabeculae carneae E) mitral valve