how does blood clot ? plzz answer it from any referance or book not from net as same ans ... plzz gyes answer it???
Answers
Answer:
Coagulation of Blood
You know that when you cut your finger or hurt yourself, your wound
does not continue to bleed for a long time; usually the blood stops flowing
after sometime. Do you know why? Blood exhibits coagulation or clotting
in response to an injury or trauma. This is a mechanism to prevent
excessive loss of blood from the body. You would have observed a dark
reddish brown scum formed at the site of a cut or an injury over a period
of time. It is a clot or coagulam formed mainly of a network of threads
called fibrins in which dead and damaged formed elements of blood are
trapped. Fibrins are formed by the conversion of inactive fibrinogens in
the plasma by the enzyme thrombin. Thrombins, in turn are formed from
another inactive substance present in the plasma called prothrombin. An
enzyme complex, thrombokinase, is required for the above reaction. This
complex is formed by a series of linked enzymic reactions (cascade
process) involving a number of factors present in the plasma in an inactive
state. An injury or a trauma stimulates the platelets in the blood to release
certain factors which activate the mechanism of coagulation. Certain
factors released by the tissues at the site of injury also can initiate
coagulation. Calcium ions play a very important role in clotting.
Explanation:
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