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Inhaling and exhalingInhalingThe intercostal muscles contract, expanding the ribcage The diaphragm contracts, pulling downwards. The thorax (top part of your body) increases
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Inhaling and exhaling Inhaling * The intercostal muscles contract, expanding the ribcage * The diaphragm contracts, pulling downwards. * The thorax (top part of your body) increases in volume, lowering the pressure inside it and sucking air into the lungs. Exhaling * The intercostal muscles relax, allowing the ribcage to drop inwards and downwards. * The diaphragm relaxes, moving back upwards. The result is that ... * The thorax decreases in volume, increasing the pressure inside it and forcing air out. As it is inhaled, the air travels down the trachea and through one of the two bronchi into one of the lungs. It then passes into the many branching bronchioles, finally arriving into some of the millions of tiny sacs called alveoli. This is where gas exchange takes place - oxygen passing out of the air into the blood, and carbon dioxide passing out of the blood into the air in the alveoli. Gas exchange Gas...
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