Mechanism of breathing
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The action of breating in and out is due to change of pressure within the thorax in comparison with the outside. This action is also known as external respiration when we inhale the intercostal muscle and diaphragm contract to expand the chest cavity
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The processes of inspiration (breathing in) and expiration (breathing out) are vital for providing oxygen to tissues and removing carbon dioxide from the body. Inspiration occurs via active contraction of muscles – such as the diaphragm – whereas expiration tends to be passive, unless it is forced.
In this article, we shall look at the physiology of ventilation – the process of inspiration and expiration, how this differs between quiet and forced breathing, and their clinical correlations.
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