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WAEC Biology 2006 Question 16

Question 16

Transport in Animals

The ventricles of the mammalian heart have thicker muscular walls than the auricles because the

  1. A.ventricles are larger
  2. B.ventricles receive more blood
  3. C.ventricles pump blood to longer distances
  4. D.auricles have smaller capacity
Show the answer and explanation

Answer: C (ventricles pump blood to longer distances)

Explanation

Auricles only push blood into the ventricles below them, but ventricles must pump it to the lungs and all round the body, so they need thicker muscle.