Platelets - blood Platelets produced in the bone marrow are...

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blood Platelets * produced in the bone marrow * are membrane enclosed fragments of the megakaryocyte * involved in blood clotting mechanisms * life span is 5 to 9 days Plasma * the liquid portion of blood * consist of 91.5% water and 8.5% solute (plasma proteins, gases, electrolytes, waste products, enzymes, hormones) * plasma proteins- * Albumin - manufactured in the liver and is responsible for maintaining blood volume. Comprise 55% of the plasma proteins. * Globulins - Comprise 38% of the plasma proteins. Produced by the lymphocytes (antibodies) and functions in immunity. * Fibrinogen - 7% of plasma proteins. Functions in blood clotting and is produced by the liver. Hemostasis The stoppage of bleeding Three mechanisms * vascular spasm - When the smooth muscle in the vascular wall contracts which serves to reduce blood flow to the damaged vessel. * platelet plug formation - platelet contact with damaged vessel causes a series of reactions that results in massive platelet adhesion at site of damage ( platelet plug ). Is reinforced with fibrin threads during coagulation.
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