WAEC Biology 2017 Objective — Question 12
Question 12 of 50 from the West African Examinations Council (WAEC) Biology 2017 Objective paper, with the correct answer and a full explanation.
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Which of the following actions does not occur during exhalation in man?
- A. A. Thoracic cavity decreases in volume
- B. B. Diaphragm flattensCorrect
- C. C. Ribs move down and in
- D. D. Air pressure increases in the thoracic cavity
Explanation
It is during inhalation that the diaphragm contracts and becomes flattened. During exhalation, the diaphragm relaxes and assumes its dome shape.
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