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Q.

Which of the following statements are correct?

I. Ca+2 is necessary for blood coagulation.

II. Tunica media of blood vessels consists smooth muscles and elastic fibres.

III. Clotting of blood involves conversion of prothrombin to fibrin by thrombin.

IV. Blood clotting does not occur in hemophilia due to absence of calcium.

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a

I, III, IV

b

III, IV

c

II, IV

d

I, II

answer is C.

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Detailed Solution

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Clotting of blood involves conversion of fibrinogen to fibrin by thrombin.

Haemophilia is a hereditary blood disorder which occurs due to deficient production of certain clotting factor proteins involved in blood clotting. It results in excessive bleeding into joints, deep tissues, etc.

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Which of the following statements are correct?I. Ca+2 is necessary for blood coagulation.II. Tunica media of blood vessels consists smooth muscles and elastic fibres.III. Clotting of blood involves conversion of prothrombin to fibrin by thrombin.IV. Blood clotting does not occur in hemophilia due to absence of calcium.