Bleeding, technically known as hemorrhage (American English) or haemorrhage (British English) is the loss of blood from the circulatory system. Bleeding can occur internally, where blood leaks from blood vessels inside the body or externally, either through a natural opening such as vagina, mouth or rectum, or through a break in the skin. The complete loss of blood is referred to as exsanguination and desanguination is a massive blood loss. Loss of 10-15% of total blood volume can be endured without clinical sequelae in a healthy person, and blood donation typically takes 8-10% of the donor's blood volume. Causes, prevalence, and risk factors Hemorrhage generally becomes dangerous, or even fatal, when it causes hypovolemia (low blood volume) or hypotension (low blood pressure). In these scenarios various mechanisms come into play to maintain the body's homeostasis. These include the "retro-stress-relaxation" mechanism of cardiac muscle, the baroreceptor reflex and renal and endocri

Source: http://en.wikipedia.org/wiki/Haemorrhage
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