Multiple choice

Blood clotting cannot take place in the absence of

  1. vitamin A

  2. vitamin K

  3. calcium ions

  4. vitamin B
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Vitamin K is essential for the synthesis of clotting factors II, VII, IX, and X in the liver. Without vitamin K, these factors cannot be properly carboxylated and become functionally inactive, leading to impaired blood clotting. This is why vitamin K deficiency causes bleeding disorders.

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