Give reasons .the lungs always contain a residual volume of air
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otherwise lungs would Collado so even if u exhale hard some resedual volume always remsins in lungs so as to prevent the lungs from collasping
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Residual volume is the amount of gas remaining in the lungs at the end of a maximal exhalation. The lungs always contain a residual volume of air so that during breathing cycle there is sufficient time for oxygen to be absorbed and for the carbon dioxide to be released
Hope it help you!!
Hope it help you!!
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