how does the movemont of the diaphgarm cause the air to go in and out of the lungs?
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During inspiration ,that is, during inhaling the air ,the diaphragm becomes straight from dome shaped ,due to this pulmonary volume increases,as a result of which intra pulmonary pressure decreases as compared to atmospheric pressure and as air moves from high pressure to low pressure ,so movement of air will be from atmosphere into the lungs.
During expiration, the diaphragm again regains it's original shape that is , become dome shaped ,so pulmonary volume decreases and intra pulmonary pressure increases so air will move from lungs to atmosphere.
During expiration, the diaphragm again regains it's original shape that is , become dome shaped ,so pulmonary volume decreases and intra pulmonary pressure increases so air will move from lungs to atmosphere.
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During inspiration, the ribs move upward and outward due to the contraction of external intercoastal muscles. The diaphgarm as well flattens down to an almost horizontal plane. This combined movement of ribs and diaphragm increases the pressure inside the thoraic cavity. The pressure inside lungs also decreases below the atmospheric pressure. So ,the air from the atmosphere rushes in to equalize the pressure. In this manner the diaphragm causes the air to go in. During expiration,the external intercoastal muscles relax and moves the ribs in.The lungs are compressed and forced to give out the air inside it.The diaphragm moves back to its dome like structure and decreased the thoraic cavity.Thus we exhale the air to the atmosphere.
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