Which cell type lacks a nucleus and participates in blood clotting?

Which cell type lacks a nucleus and participates in blood clotting?

• A. Platelets
• B. Neutrophils
• C. Lymphocytes
• D. Erythrocytes

Answer: (A)

Platelets are small, anucleate cytoplasmic fragments derived from megakaryocytes. They lack a nucleus and play a key role in hemostasis: they adhere to exposed vessel wall, become activated, and release granules that recruit more platelets to form a plug. They also provide a surface for the coagulation cascade to generate fibrin, which stabilizes the clot. While erythrocytes also lack a nucleus, their main job is oxygen transport, not clotting. Neutrophils and lymphocytes have nuclei and are immune cells. So the cell type that lacks a nucleus and participates in blood clotting is platelets.

Platelets are small, anucleate cytoplasmic fragments derived from megakaryocytes. They lack a nucleus and play a key role in hemostasis: they adhere to exposed vessel wall, become activated, and release granules that recruit more platelets to form a plug. They also provide a surface for the coagulation cascade to generate fibrin, which stabilizes the clot. While erythrocytes also lack a nucleus, their main job is oxygen transport, not clotting. Neutrophils and lymphocytes have nuclei and are immune cells. So the cell type that lacks a nucleus and participates in blood clotting is platelets.