Chapter 20, Problem 16RA

The contents of the birth control pill

$\begin{array}{l}\text{a}\text{. inhibit secretion of gonadotropins}\text{.}\hfill \\ \text{b}\text{. exert negative feedback on the hypothalamus}\text{.}\hfill \\ \text{c}\text{. prevent ovulation}\text{.}\hfill \\ \text{d}\text{. maintain the endometrium}\text{.}\hfill \\ \text{e}\text{. All of these}\text{.}\hfill \end{array}$