What is the function of platelets in the blood?
Answer (1)
Platelets, also called thrombocytes, are small, disc-shaped cell fragments in the blood that play a vital role in blood clotting and wound healing. Though they are not complete cells, they are produced in the bone marrow from large cells called megakaryocytes.Main functions:Clot formation (hemostasis):When a blood vessel is injured, platelets are among the first to respond.They stick to the damaged area, clump together (platelet aggregation), and form a temporary platelet plug.They also release chemicals that signal other clotting factors and start the coagulation cascade, resulting in the formation of fibrin, a protein that strengthens the clot.Prevent excessive bleeding:Platelets ensure that bleeding stops quickly and that the wound is sealed off until tissue healing occurs.A stable clot also protects the area from infection.Promote healing:Platelets release growth factors that help repair and regenerate damaged tissue.A normal platelet count ensures effective clotting. If platelet numbers are too low (thrombocytopenia), a person may bruise or bleed easily. If they are too high (thrombocytosis), there is a risk of abnormal clotting, which could lead to strokes or heart attacks.
