In blood, platelets are required for:
transporting oxygen
transporting carbon dioxide
initiating blood clotting
initiating degradation of urea
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This question was previously asked in
UPSC NDA-2 – 2015
Platelets, also known as thrombocytes, are small, anucleated cell fragments in the blood that play a crucial role in hemostasis, the process by which bleeding is stopped. When a blood vessel is injured, platelets aggregate at the site of injury, forming a platelet plug. They also release factors that activate the coagulation cascade, a complex series of reactions leading to the formation of a fibrin clot, which reinforces the platelet plug and seals the damaged vessel. Red blood cells (erythrocytes) are responsible for transporting oxygen. Carbon dioxide is transported in the blood in various forms (dissolved in plasma, bound to hemoglobin, or as bicarbonate ions). Urea is a waste product transported by the blood to the kidneys for excretion; its degradation primarily occurs in the liver during its formation from ammonia.