Menstruation, periodic discharge from the vagina of blood, secretions, and disintegrating mucous membrane that had lined the uterus. 1  The biological significance of the process in humans can best be explained by reference to the reproductive function in other mammals.
Chlamydia is a common sexually transmitted disease (STD) caused by infection with Chlamydia trachomatis. It can cause cervicitis in women and urethritis and proctitis in both men and women.
1 Chlamydia is a very common sexually transmitted disease caused by a species of bacteria known as Chlamydia trachomatis. 2  One in 15 sexually active 14 to 19-year-old females isâ¦. 3  Chlamydia Signs and Symptoms Chlamydia is a common sexually transmitted disease.