Dictionary > Hemorrhage


The escape of blood from the vessels within or from the body; bleeding
To bleed profusely
Hemorrhage refers to the escape of blood from the blood vessels. The blood corpuscles are discharged from their normal route in the blood circulatory system, caused by wounds and diseases. It may occur internally (i.e. inside the body) or externally (i.e. through orifices or a break in the skin). Excessive blood loss such as in exsanguination could lead to death. In humans, a blood loss of 10 to 15 % of the total blood volume would generally not lead to any major health risk. However, beyond that limit could cause death. The body has to prevent too much blood loss and it does so by hemostasis. Hemostasis is a process that stops or arrest bleeding. It helps keep the blood within the damaged blood vessel. This is the first stage of tissue repair and wound healing and involves three major stages: (1) vascular spasm or vasoconstriction, temporary blockage of a break by a platelet plug, and (3) blood coagulation (clot formation).
Small haemorrhages are classified according to size as petechiale (very small), purpura (up to 1 cm) and ecchymoses (larger). The massive accumulation of blood within a tissue is called a haematoma.
Word origin: Latin haemorrhagia, from Ancient Greek haimorrhagía (“a violent bleeding”), from haîma (“blood”) + –ragía, rhēgnúnai (“to break, burst”)

  • Haemorrhage

See also:

  • blood
  • hemostasis
  • Related term(s):

    You will also like...

    A sperm cell fertilizing an ovum
    Human Reproduction and Fertilization

    For human species to obviate extinction, reproductive mature adults should be producing viable offspring in order to con..

    Selective Breeding
    Selective Breeding

    Gregor Mendel's studies into Monohybrid and Dihybrid crossing and Charles Darwin's study of evolution and natural select..

    Growth Patterns
    Growth Patterns

    This tutorial describes the sigmoid curve, annual plant growth, tree growth, human growth, and insect growth as the grow..

    Disturbance on a still water
    Abiotic Factors – Water Conditions

    A still body of water may be disturbed by a variety of factors. One of them is wind. In fact, it is considered as the pr..

    An artist depiction of a Precambrian multicellular life form.
    The Evolution of Cell Organelles

    The nucleus containing the genetic material, DNA, and the mitochondria, well-identified as the "powerhouse of the cell",..

    Flowers and tiny fruits of the pomegranate plant
    Fruits, Flowers, and Seeds

    This tutorial deals with the structure and function of flowers, fruits, and seeds. Also included here are the types of f..