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.
Chlamydia trachomatis. By Ashley Wiser. Chlamydia, also known as the silent STI due to its lack of symptoms in infected individuals, is a bacterial infection caused by Chlamydia trachomatis (1). Chlamydia trachomatis is an intracellular parasite that survives within targets cells of mucous membrane. Mucous membranes that are susceptible to infection include surfaces of the urethra, vagina, cervix, and endometrium, fallopian tubes, anus, rectum, eyelid, and throat (2) .