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WAEC Biology 2010 Question 13

Question 13

Transport in Animals

A pulse is best described as

  1. A.contraction of arteries to let out blood.
  2. B.contraction of veins to allow blood into them.
  3. C.dilation of arteries to accommodate blood rushing through.
  4. D.pumping action of the heart to move blood round the body.
Show the answer and explanation

Answer: C (dilation of arteries to accommodate blood rushing through.)

Explanation

Each heartbeat pushes a surge of blood that stretches the elastic artery wall; this rhythmic stretching is felt as the pulse.