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WAEC Biology 2002 Question 15

Question 15

Respiration

Which of the following does not occur during inhalation in mammals?

  1. A.Rib cage is raised up
  2. B.Diaphragm contracts and becomes dome shaped
  3. C.Inter-costal muscle contracts
  4. D.Volume of the thoracic cavity increases.
Show the answer and explanation

Answer: B (Diaphragm contracts and becomes dome shaped)

Explanation

When we breathe in, the diaphragm contracts and flattens. It becomes dome-shaped when it relaxes during exhalation.