What is the usual effect of diaphragm contraction during quiet breathing?
Correct answer: B. It increases thoracic volume
- A. It decreases thoracic volume
- B. It increases thoracic volume
- C. It closes the small bronchioles
- D. It increases pressure inside the lungs
Explanation
When the diaphragm contracts, it flattens and increases the volume of the thoracic cavity. This lowers intrapulmonary pressure below atmospheric pressure, so air flows into the lungs.
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About Respiratory System
The respiratory system includes the air passages, lungs, pleura, alveoli and the mechanics of breathing. It explains pulmonary ventilation, gas exchange, oxygen and carbon dioxide transport, regulation of breathing, and the difference between external respiration in the lungs and internal respiration in body tissues.
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