Inhalation: Air is forced into the lungs, The rib cage is moving upwards, Intercostal muscles contract, The chest expands, Air pressure outside the lungs is lower, Diaphragm contracts/pulls down and becomes flat, Exhalation: Air is forced out of the lungs, The rib cage is moving downward, Intercostal muscles relax, Thoracic cavity decreases, Air pressure inside the lungs is higher, Diaphragm relaxes and curves upward,

KS2 Breathing Mechanism

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