What is the role of fibrin in blood clotting?
A. acts as an enzyme
B. forms a mesh of fibres to cover the wound
C. causes smooth muscles in blood vessels to contract
D. starts off the whole process
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A boy accidentally cut his finger. the blood clots occur slowly. What caused the blood to clot slowly?
A. Lack of vitamin D in his meal
B. Lack of vitamin K in his meal
C. The blood of the boy is infected with pathogens
D. The blood of the boy flow with high pressure at the wound
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