Multiple choice

Blood does not coagulate inside the body due to the presence of

  1. Fibrin

  2. Haemoglobin

  3. Plasma

  4. Heparin

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Blood does not clot inside the body because if a person's blood contains antigen a, then serum must contain anybody b, serum should not contain antibody a otherwise the person's blood will agglutinate.