Active sites on the actin become available for binding when
A) Actin binds to troponin.
B) Troponin binds to tropomyosin.
C) Calcium binds to troponin.
D) Calcium binds to tropomyosin.
E) Myosin binds to troponin.
C) Calcium binds to troponin.
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Which of the following is incorrect pertaining to the pericardium?
A) It consists of visceral and parietal layers of serous pericardium, and the fibrous pericardium. B) The visceral and parietal layers of the serous pericardium are continuous around the aorta and pulmonary trunk where they exit the heart. C) It is mainly supplied with blood from the pericardiophrenic artery. D) It has pain fibers that are conveyed by the intercostal nerves. E) It encloses the terminal part of the inferior vena cava.
The microcirculation is composed of:
a. arteries, arterioles, and capillaries. b. arterioles, capillaries, and venules. c. arteries, capillaries, and venules. d. arteries, arterioles, and venules. e. none of these answers.
What structure is cut and tied off in a vasectomy?
A) the penis B) the epididymis C) the urethra D) the seminiferous tubules E) the vas deferens
The greatest resistance to blood flow and therefore the greatest drop in pressure occurs as blood passes through the ________.
A. large arteries B. venules C. large veins D. arterioles