How does the respiratory system work?
Answer: Inspired air rich in oxygen enters the body through the nostrils or mouth. It passes through the pharynx and larynx, or voice box, and into the trachea. Air then enters each bronchus, which branch into bronchioles, and finally into the alveoli, or air sacs of the lungs. The lungs are housed in the thoracic cavity that is bound on the bottom by a thin layer of muscle, the diaphragm. Each lunch is covered by a very thin pleual membrane. In the alveoli, carbon dioxide is exchanged to oxygen.
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Respiratory System
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