Which of the following statements is true for inspiration (breathing in)?
Correct answer: E. External intercostal muscles contract
- A. Internal intercostal muscles contract
- B. External intercostal muscles relax
- C. Diaphragm relaxes
- D. Occurs due to increased pressure in thoracic cavity
- E. External intercostal muscles contract
Explanation
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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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