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. Introduction: Chlamydia Trachomatis is the organism responsible for diseases such as trachoma and the STD Chlamydia. Chlamydia is the most common STD in the United States, with about 4 million new cases diagnosed every year. The Organism & itâs Life Cycle: Chlamydia are obligate intracellular parasites, and are among the smallest living organisms. There are two stages in the life of Chlamydia: elementary bodies and reticulate bodies.