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WAEC Biology 2022 Question 11

Question 11

Respiration

Use the following processes to answer this question.
I. Ribs move upward and outward
II. Diaphragm relaxes
III. Volume of thorax increases
IV. Air is forced out of the lungs
Which of the processes take place during inspiration?

  1. A.I and III only
  2. B.II and III only
  3. C.II and IV only
  4. D.III and IV only
Show the answer and explanation

Answer: A (I and III only)

Explanation

Breathing in: ribs move up and out and the diaphragm contracts, so the thorax gets bigger. Diaphragm relaxing and air forced out happen in expiration.