B3 1.5 Ventilating the lungs

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  • B3 1.5 Ventilating the lungs
    • The lungs are in your thorax protected by your ribcage and separated from your abdomen by the diaphragm.
    • The intercostal muscles contract to move your ribs up and out and flatten the diaphragm, increasing the volume of your thorax. The pressure decreases and air moves in.
    • The intercostal muscles relax and the ribs move down and in, and the diaphragm domes up, decreasing the volume of your thorax. The pressure increases and air is forced out.

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