Multiple choice

Which of the following is essential for blood clotting?

  1. RBC

  2. WBC

  3. Blood platelets

  4. Lymph
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Blood platelets (thrombocytes) are cell fragments that are essential for blood clotting. They clump together at the site of injury and release clotting factors. RBCs carry oxygen, WBCs fight infection, and lymph is part of the lymphatic system - none directly cause clotting.

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