ANIMAL PHYSIOLOGY
HUMAN CIRCULATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Clots formed by clusters of leukocytes.
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Clots formed by platelets and blood proteins.
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Masses of erythrocytes and erythrocyte fragments.
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Constriction of capillaries in the damaged area.
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Detailed explanation-1: -Primary hemostasis is when your body forms a temporary plug to seal an injury. To accomplish that, platelets that circulate in your blood stick to the damaged tissue and activate. That activation means they can “recruit” more platelets to form a platelet “plug” to stop blood loss from the damaged area.
Detailed explanation-2: -The main job of platelets, or thrombocytes, is blood clotting. Platelets are much smaller in size than the other blood cells. They group together to form clumps, or a plug, in the hole of a vessel to stop bleeding.
Detailed explanation-3: -Platelet factors The “glue” that holds platelets to the blood vessel wall is von Willebrand factor, a large protein produced by the cells of the vessel wall. The proteins collagen and thrombin act at the site of the injury to induce platelets to stick together.
Detailed explanation-4: -One important clotting factor is fibrin, a long, thin, and sticky protein. When it is turned on, it forms a mesh to hold the platelet plug in place. This is called a fibrin clot. The mesh also traps red blood cells to form a blood clot.
Detailed explanation-5: -The clotting proteins that function as zymogens in the blood include factor XII, factor XI, prekallikrein, factor IX, factor X, factor VII, and prothrombin.