Group 1, Inhalation, The diaphragm contracts and move downwards, External intercostal muscles contract, Ribs move up and outwards., thoracic volume increases, Air pressure inside the lungs decreases., Air moves into the lungs, Group 2, exhalation, The diaphragm relaxes and moves back upwards, external intercostal muscles relax, Ribs moves down and inwards, thoracic volume decreases, Air pressure inside the lungs increases., Air moves out of the lungs

ventilation

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恢復自動保存: ?