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A person is injured while playing on the...

A person is injured while playing on the ground. Blood is flowing continuously. What might be the reasons?

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In this case blood is not clotting. Because
1) He may be suffer from 'Haemophilia'.
2) Blood platelets are less in number.
3) He may suffer from vitamin K deficiency.
4) Enzyme ''Thrombokinase'' may not release.
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