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Lungs act as the main primary organs of the respiratory system. The other respiratory components that conduct air to the lungs include the trachea and bronchi (smaller structures). There are two distinct phases that are used in the breathing process which include expiration (exhalation) and inspiration (inhalation). The diaphragm contracts during inhalation and pulls down while there is a contraction on the muscles between the ribs. As such, there is an increment in the thoracic cavity and the pressure inside is decreased which results in the air rushing in and filling the lungs (McLaughlin, 2009). On the other hand…..(buy to read more).
Appx. 900 words.
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