I) flow of sap from plant wounds. injuries. or pathogen invasion. 2) flow of blood from a human or animal wound. 3) process of removing air from a fluid system (such as hydraulic brakes on a vehicle).
This article about biology may be excessively human-centric. |
Bleeding, hemorrhage, haemorrhage or blood loss is blood escaping from the circulatory system from damaged blood vessels. Bleeding can occur internally, or externally either through a natural opening such as the mouth, nose, ear, urethra, vagina or anus, or through a puncture in the skin. Hypovolemia is a massive decrease in blood volume, and death by excessive loss of blood is referred to as exsanguination. Typically, a healthy person can endure a loss of 10–15% of the total blood volume without serious medical difficulties (by comparison, blood donation typically takes 8–10% of the donor's blood volume). The stopping or controlling of bleeding is called hemostasis and is an important part of both first aid and surgery.
| Bleeding | |
|---|---|
| Other names | Hemorrhaging, haemorrhaging, blood loss |
 | |
| A bleeding wound in the finger | |
| Specialty | Emergency medicine, hematology |
| Complications | Exsanguination, hypovolemic shock, coma, shock |