The process of spermatogenesis from primary spermatocyte to sperm:
A. takes about three weeks in the human.
B. occurs when a male is an embryo, ceasing at birth.
C. requires participation of Sertoli cells.
D. occurs in the epididymis.
E. occurs as the cells gradually travel between two closely attached Leydig cells.
C
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Cardiac output
a. is the volume of blood pumped by each ventricle during each contraction or beat. b. is the volume of blood pumped by each ventricle per minute. c. equals heart rate x stroke volume. d. both (a) and (c) above. e. both (b) and (c) above.
Data gathered on social class variations in sexuality indicate that overall about _____ of all people engage in oral sex.
A. 25 percent B. 50 percent C. 75 percent D. 90 percent
What physiological process occurs at the structure labeled "1"?
Specifically, what part of the intrinsic conduction system stimulates the atrioventricular (AV) node to conduct impulses to the atrioventricular bundle?
sinoatrial (SA) node bundle branches subendocardial conducting network (Purkinje fibers) interventricular septum