Quick Quiz: Nouns Score: Change category, Flip order Reset Correct! Noun: secretory phase Your choice? a small army unit usually having a special function the state of being free from danger or injury a car that is closed and that has front and rear seats and two or four doors the second half of the menstrual cycle after ovulation; the corpus luteum secretes progesterone which prepares the endometrium for the implantation of an embryo; if fertilization does not occur then menstrual flow begins