Which of the following structures produces early blood cells and the gonadal tissues of the embryo?
A. The amnion
B. The chorion
C. The yolk sac
D. The allantois
E. The ectoderm
Answer: C
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Which of the following is not true of testosterone?
A. It is a major male sex hormone. B. It is produced by the sustentacular cells in the seminiferous tubules. C. It has a significant effect on sex drive. D. It is responsible for the development of secondary sexual characteristics. E. All of these are true of testosterone.
From innermost to outermost, the three layers of a vessel, with the exception of capillaries, are the tunica intima, tunica media, and tunica externa
Indicate whether the statement is true or false
Which vessel brings blood to the heart from the trunk and pelvic region?
A. Superior vena cava B. Inferior vena cava C. Superior aorta D. Inferior artery
All cells must obtain nutrients, form new chemical structures, and dispose of waste molecules
Indicate whether this statement is true or false.