In mammals , the vagina is the elastic, muscular part of the female genital tract. In humans, it extends from the vulva to the cervix. The outer vaginal opening is normally partly covered by a membrane called the hymen. At the deep end, the cervix neck of the uterus bulges into the vagina. The vagina allows for sexual intercourse and birth. It also channels menstrual flow menses , which occurs in humans and closely related primates as part of the monthly menstrual cycle.
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As adults, we know that a healthy digestive system is essential for good health because it converts food into raw materials that build and fuel our body cells. The organs of the digestive system can be separated into two main groups: those forming the alimentary canal and the accessory digestive organs. The alimentary canal, also called the gastrointestinal tract, is a continuous, hollow muscular tube that winds through the ventral body cavity and is open at both ends. Its organs include the following:. Food enters the digestive tract through the mouth , or oral cavity, a mucous membrane-lined cavity. The esophagus or gullet , runs from the pharynx through the diaphragm to the stomach. The role the teeth play in food processing needs little introduction; we masticate, or chew, by opening and closing our jaws and moving them from side to side while continuously using our tongue to move the food between our teeth.
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Last Updated: May 28, References. She graduated from the University of Glasgow in with a degree in veterinary medicine and surgery. She has worked at the same animal clinic in her hometown for over 20 years. There are 13 references cited in this article, which can be found at the bottom of the page. This article has been viewed , times.