Bateman’s principle

In most cases, it is the male’s secondary sexual traits that are exaggerated.

This shows that sexual selection is more common and intense on males than females

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#Unit 7. System Physiology – Animal

von Willebrand factor deficiency likewise causes a bleeding disorder (von Willebrand disease) by reducing platelet adhesion and by lowering plasma factor VIII

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#Unit 7. System Physiology – Animal

Hemophilia B (Christmas disease), is caused by factor IX deficiency.

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#Unit 7. System Physiology – Animal

Anticlotting mechanisms  The tendency of blood to clot is balanced in vivo by reactions that prevent clotting inside the blood vessels, break down any clots that 

do form, or both.

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Antithrombin III is a circulating protease inhibitor that binds to serine proteases in the coagulation system, blocking their activity as clotting factors.

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Antithrombin III is a circulating protease inhibitor that binds to serine proteases in the coagulation system, blocking their activity as clotting factors.

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The endothelium of the blood vessels also plays an active role in preventing the extension of clots.