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JAMB Biology 1983 Question 36

Question 36

Transport in Animals

Which of the following statements on the mammalian circulatory system is NOT true?

  1. A.Blood in the pulmonary artery is richer in oxygen content than blood in the pulmonary vein
  2. B.The blood in the hepatic portal vein is the richest in food substances
  3. C.Blood flow is controlled by valves in the veins
  4. D.Arteries are generally thicker and larger than veins
  5. E.Fibrin helps in the formation of blood clot.
Show the answer and explanation

Answer: A (Blood in the pulmonary artery is richer in oxygen content than blood in the pulmonary vein)

Explanation

The pulmonary artery carries deoxygenated blood to the lungs, and the pulmonary vein brings oxygenated blood back, so statement A is the wrong way round.