A Detailed Analysis of Human Respiratory Mechanics and Function

The Mechanics and Physiology of Human Respiratory System

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Q1. Describe the mechanics of inspiration and expiration in a resting person

Breathing also referred to as ventilation is involved with the air movement into and out of the lungs to the atmosphere. The breathing process comprises two phases, which are inspiration and expiration. West (2014) indicated that the main muscles that are involved in the breathing movements are the diaphragm which forms the chest cavity floor, the intercostals muscles that are attached to the ribs. During the process of inspiration, the external intercostals muscles and diaphragm contract allowing the air to flow in. Petechuk (2010) indicated that the diaphragm moves down during inspiration and this increases the volume of the chest (thoracic) cavity. On the other hand, the external intercostals muscles pull the ribs outward and upwards. This…