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Asked by Dremy to Peter, Bernerd on 12 Jul 2017.
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Bernerd Fulanda answered on 12 Jul 2017:
Dremy
Blood doesn’t clot inside the blood vessel because the chemical (plasma proteins) which causes the blood to clot in the cut area gets activated only when it comes in contact with air (oxygen actually) to form the clotting substance.
therefore when u get internal bleeding, its dangerous and often leads to death because likely coming into contact with oxygen air is lower than when u cut ur skin on the surfae; internal bleeding is also difficult to manage
kind regards
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Comments
Joseph commented on :
When blood is exposed to new surface or air it clots.
to answer your question further we know that the Blood clotting factors are intrinsic and extrinsic. Intrinsic factors when are in cells, tissues and plasma blood do not clot. Some of the factors as surface activation factor stimulates blood to clot when exposed.
Inside the body liver secretes a substance called heparin. This prevents clotting of blood in blood vessels. But if there is internal injury, platelets break to release a thermoplastic substance. It initiates clotting.