Analysis Of Diaphragm And Intercostal Muscles Contracting

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The mode of quiet breathing involves the diaphragm and intercostal muscles contracting during the inhalation process. Following the diaphragm muscles contracting, it then travels passively towards the abdominal cavity, resulting in a larger thoracic cavity and an increased lung space. The intercostal muscles also contract, and then moves in an ‘upward and outward’ direction which expands the rib cage and increases chest volume. The expiration process is the opposite of inhalation, this process requires no muscle contractions, instead is influenced by the elasticity of the lungs. As the lungs expand, the elasticity of lung tissue causes the lungs to retreat. This retreat occurs as the diphram and intercostal muscles relax after inhalation.

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