Chapter 20, Problem 24RA

Summary Introduction

To review:

The differences between menstrual bleeding and estrous bleeding in terms of hormonal control mechanisms, and the ovarian cycle.

Introduction:

Female primates exhibit the menstrual cycle, while the non-primates have the estrous cycle. The menstrual cycle in the primates is spanned over four phases and one cycle lasts for about 28 days. The estrous cycle is a property of the mammalian, therian females that begins after sexual maturity is attained.