Contraction of diaphragm and the intercostal muscles - increasing thoracic volume - reducing pressure in the intrapleural space creating a vacuum that causes the lungs to suck in air - as well as draw in blood from the rest of the body (particularly

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1. Contraction of diaphragm and the intercostal muscles - increasing thoracic volume - reducing pressure in the intrapleural space creating a vacuum that causes the lungs to suck in air - as well as draw in blood from the rest of the body (particularly