During inspiration the
Correct answer: A. Chest wall is raised and diaghram is lowered
- A. Chest wall is raised and diaghram is lowered
- B. Chest wall is raised and diaghram is also raised
- C. Chest wall is lowered and diaghram is raised
- D. Chest wall is lowered and diaghram is also lowered
Explanation
Ok we will go through inspiration and expiration on a conceptual basis During inspiration, air moves in the lungs, so atmospheric pressure inside the lungs must be lower than the outside so that air moves from higher pressure to lower pressure So for lowering pressure there must be an increase in the volume of the chest cavity, For that diaphragm contracts and moves downward(lowers), chest walls are raised These both events in addition to many other events cause an increase in the volume of the chest cavity, thus air moves in Opposite occur in expiration.
This question appeared on the ETEA MDCAT 2005 paper, which you can sit online with every answer explained.
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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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