The primary feature that distinguishes a menstrual cycle from an estrous cycle is that
A) females can mate at any time during the estrous cycle.
B) females can only mate around the time of ovulation in the menstrual cycle.
C) there is no cycle of growth/loss of the uterine lining in the estrous cycle.
D) the estrous cycle does not involve the secretion of estrogens.
E) the estrous cycle is longer than the menstrual cycle.

Question

Quizplus · Accepted Answer

The primary distinction between a menstrual cycle and an estrous cycle is that in the estrous cycle, there is no cyclical shedding of the uterine lining (endometrium) as seen in the menstrual cycle. In the menstrual cycle, the endometrium is built up to prepare for potential pregnancy and then shed if pregnancy does not occur, leading to menstruation.

The Primary Feature That Distinguishes a Menstrual Cycle from an Estrous