Menstruation is initiated by
a. a rapid increase in estrogen levels.
b. a rapid drop in estrogen levels.
c. a rapid drop in progesterone levels.
d. both (a) and (b) above.
e. both (b) and (c) above.
E
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Estrogen exerts a ________ influence on the hypothalamus, increasing secretion of ________ and thus increasing LH and FSH secretion.
A. negative; GnRH B. positive; progesterone C. negative; progesterone D. positive; GnRH
What advantages does ATP have in being the energy currency molecule?
What will be an ideal response?
Which muscle has three attachments to bone?
A) mylohyoid B) stylohyoid C) sternocleidomastoid D) thyrohyoid E) sternohyoid
If a substance is not immunogenic by itself, but initiates an immune reaction when combined with a protein in the body, that substance is called a ________.
Fill in the blank(s) with the appropriate word(s).