Home » UPSC NDA-2 » In blood, platelets are required for:

In blood, platelets are required for:

June 1, 2025 by rawan239

In blood, platelets are required for:

transporting oxygen

transporting carbon dioxide

initiating blood clotting

initiating degradation of urea

This question was previously asked in

UPSC NDA-2 – 2015

Download PDF Attempt Online

The correct option is C, initiating blood clotting.

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.

Deficiency or dysfunction of platelets can lead to bleeding disorders, such as thrombocytopenia. Conversely, excessive platelet activation can contribute to the formation of blood clots (thrombosis) within blood vessels, which can lead to serious conditions like heart attacks or strokes.

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