The level of organization one step more complex than the organ level is the ________ level.
Fill in the blank(s) with the appropriate word(s).
organ system
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In one kind of second-messenger system,
a. a small amount of one hormone (second messenger) is required to release another b. a tropic hormone (first messenger) stimulates secretion of another hormone (the second messenger) c. the hormone binds to a specific surface receptor, whereupon the hormone-receptor complex moves into the cell to combine with an intracellular receptor d. releasing hormones (first messenger) from the hypothalamus regulate anterior pituitary hormones (second messengers) e. a hormone (first messenger) binds to surface receptors that activate adenylate cyclase, which then catalyzes cAMP formation
Which hormones are secreted by the ovary? select all that apply.
a) inhibin b) growth hormone c) follicle stimulating hormone d) progesterone e) estradiol
The hormone hCG is necessary to
A. keep the corpus luteum from degenerating. B. cause the endometrium to proliferate. C. destroy the corpus luteum. D. stimulate primary oocytes to divide. E. form the corpus luteum.
Blood vessels cover approximately ________% of the alveolar surface.
A) > 90 B) 10-20 C) < 10 D) 50 E) 80-90