Multiple choice

Which of the following is INCORRECT regarding blood coagulation in human beings?

  1. Clotting is initiated by exposure of tissue factor-bearing cells to plasma clotting factors.

  2. Fibrin monomers get cross-linked by factor XIIIa.

  3. Platelet activation stimulates production of thromboxane.

  4. Primary haemostasis initially involves vasodailation.

  5. Platelets are the fragments of megakaryocytes.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Primary haemostasis initially involves vasoconstriction in response to vascular damage, which limits blood loss and subsequent platelet adhesion to the damaged area and activation due to exposure of subendothelial matrix.

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