Tubulin is to microtubules as actin is to
A) ribosomes.
B) microfilaments.
C) intermediate filaments.
D) flagella.
E) microvilli.
B
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The multiple nuclei in skeletal muscle cells are the result of the
A. cytokinesis of embryonic satellite cells. B. stimulation of fibroblasts by hormones. C. action of testosterone on mesenchyme cell. D. spontaneous development of nuclei in embryonic cells. E. fusion of myoblasts.
Angiotensin-converting enzyme (ACE) inhibitors like captopril block the formation of angiotensin II, thus reducing ________.
A. vasodilation B. vasoconstriction C. renal excretion D. renal reabsorption
The greatest percentage of Na+ reabsorption takes place in the
a. proximal tubule. b. loop of Henle. c. distal tubule. d. collecting tubule. e. renal pelvis.
Calcium balance is influenced by
A. ADH and parathyroid hormone levels. B. ADH and aldosterone levels. C. parathyroid hormone and vitamin D levels. D. aldosterone and parathyroid hormone levels. E. insulin and glucagon.