The process of inspiration occurs as?
Correct answer: A. The diaphragm contracts, expanding the thoracic cavity
- A. The diaphragm contracts, expanding the thoracic cavity
- B. Passive transport of air occurs
- C. Air expands inside the lungs
- D. Air is pushed into the lungs
Explanation
The correct answer is that the diaphragm contracts, expanding the thoracic cavity. During inspiration, the diaphragm and external intercostal muscles contract, increasing the volume of the thoracic cavity and decreasing the pressure inside. This pressure change allows air to flow into the lungs passively. The other options are incorrect because they either lack specificity regarding the active role of muscles or incorrectly describe the mechanics of air movement.
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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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