Question

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what is the primary role of platelets in the blood?
a they help to clot the blood and prevent too much blood loss.
b they determine blood type.
c they transport oxygen to other cells.
d they destroy pathogens and provide protection.

Explanation:

• Option A: Platelets (thrombocytes) are involved in blood clotting (hemostasis) to prevent excessive blood loss when a blood vessel is damaged.
• Option B: Blood type is determined by antigens on red blood cells, not platelets.
• Option C: Red blood cells (erythrocytes) transport oxygen, not platelets.
• Option D: White blood cells (leukocytes) destroy pathogens, not platelets.

Answer:

A. They help to clot the blood and prevent too much blood loss.