Which of the Following is a True Statement

Question

Which of the following is a true statement?
A)All mammals have menstrual cycles.
B)The endometrial lining is shed in menstrual cycles but reabsorbed in estrous cycles.
C)Estrous cycles are more frequent than menstrual cycles.
D)Estrous cycles are not controlled by hormones.
E)Ovulation occurs before the endometrium thickens in estrous cycles.

Accepted Answer

In menstrual cycles, the endometrial lining is shed, while in estrous cycles, it is reabsorbed by the body. Therefore, option B is the correct choice. Option A is false because not all mammals have menstrual cycles. Option C is also false as estrous cycles are typically less frequent than menstrual cycles. Option D is incorrect because the estrous cycles are controlled by hormones, mainly estrogen and progesterone. Option E is also false as ovulation occurs after the endometrium thickens in estrous cycles.