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JAMB Biology 1984 Question 40

Question 40

Transport in Animals

Which of the following sequences represents the process of blood clotting? 1. Fibrin forms a network of threads 2 Red blood cells are caught and a clot is formed 3. Fibrinogen in plasma changes into soluble fibrin 4 Blood is exposed to air

  1. A.4,3,2,1
  2. B.4,3,1,2
  3. C.3,1,4,2
  4. D.1,2,3,4
  5. E.3, 1, 2, 4.
Show the answer and explanation

Answer: B (4,3,1,2)

Explanation

Blood is first exposed to air at the wound (4), fibrinogen is changed to fibrin (3), fibrin forms a mesh of threads (1) and red cells are trapped in it to make the clot (2).