Which term refers to the platelet involved in blood clotting?

• A. Platelet
• B. Erythrocyte
• C. Leukocyte
• D. Thrombocyte

Answer: (D)

Thrombocyte is the term that highlights the platelet's role in forming clots. Platelets are tiny, anucleate cell fragments shed from megakaryocytes in the bone marrow; when vessels are injured, they adhere to the site, become activated, and aggregate to form a plug while also helping to activate the coagulation cascade to stabilize the clot. The word thrombocyte combines thrombus (clot) with -cyte (cell), signaling its function in clot formation. In many contexts, platelet is the everyday name, but when focusing on clotting, thrombocyte is the more precise term. Erythrocytes are red blood cells, carrying oxygen, and leukocytes are white blood cells involved in immune responses.