Multiple choice

________ helps to assist clotting of blood.

  1. RBC

  2. WBC

  3. Platelet

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

Platelets (thrombocytes) are cell fragments essential for blood clotting (coagulation). When a blood vessel is damaged, platelets adhere to the site, release chemical signals to recruit more platelets, and provide surface for clotting factors to form fibrin mesh that traps blood cells to stop bleeding. RBCs carry oxygen; WBCs fight infection; plasma is the liquid medium.

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