Which of the following statement is correct?
Correct answer: A. Inspiration is an active process
- A. Inspiration is an active process
- B. Expiration is a passive process
- C. Inspiration is a passive process
- D. Both expiration and inspiration are passive processes
Explanation
Inspiration is an active process because it involves the contraction of the diaphragm and intercostal muscles, which results in the expansion of the thoracic cavity and reduces pressure inside the lungs, allowing air to flow in. On the other hand, expiration is typically a passive process because it relies on the relaxation of these muscles and the natural elastic recoil of the lungs and chest wall to expel air. In certain conditions, such as forced breathing, expiration can become active, but under normal resting conditions, it remains passive.
This question appeared on the UHS MDCAT 2022 paper, which you can sit online with every answer explained.
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About Human Respiratory System
The human respiratory system conducts air to the alveoli, where oxygen and carbon dioxide exchange occurs across thin respiratory surfaces. Questions cover the nasal passage, trachea, bronchi, lungs, diaphragm and intercostal muscles, ventilation mechanics and gas transport, while distinguishing breathing and gaseous exchange from cellular respiration.
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