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JAMB Biology 1986 Question 27

Question 27

Respiration

Which of the following statements is NOT correct with respect to inhalation in mammals? The

  1. A.intercostal muscles contract
  2. B.diaphragm is raised
  3. C.ribs are raised
  4. D.pressure of the thoracic cavity decreases.
Show the answer and explanation

Answer: B (diaphragm is raised)

Explanation

During inhalation the diaphragm muscles contract and the diaphragm flattens (is lowered), making the chest cavity larger.