Expiration in human beings is carried out by:
Correct answer: C. Relaxation of intercostal and diaphragm muscles
- A. Contraction of lungs
- B. Contraction of intercostal membrane
- C. Relaxation of intercostal and diaphragm muscles
- D. Contraction of diaphragm muscles
Explanation
Option [a] Lungs do not contractOption[b] Internal intercostal muscles contractOption [c] During expiration External intercostal muscles relax and internal intercostal muscles contract bringing the rib cage down to its normal position, muscles of the diaphragm Also relax with the chest cavity also reducedOption [d] Diaphragm muscles relax during expiration, contraction of the diaphragm does not occur.
This question appeared on the UHS MDCAT 2010 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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