MEDICAL
LUNGS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Air moves into the lungs
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Air moves out of the lungs
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Either A or B
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None of the above
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Detailed explanation-1: -Air moves into the lungs (inspiration) when the pressure inside the lungs is less than the air pressure in the atmosphere. Q. Assertion :Inspiration occurs when there is a negative pressure in the lungs with respect to the atmospheric pressure.
Detailed explanation-2: -Alveolar pressure is given with respect to atmospheric pressure, which is always set tozero. Thus, when alveolar pressure exceeds atmospheric pressure, it is positive; when alveolarpressure is below atmospheric pressure it is negative. Alveolar pressure determines whether air will flow into or out of the lungs.
Detailed explanation-3: -When the air pressure within the alveolar spaces falls below atmospheric pressure, air enters the lungs (inspiration), provided the larynx is open; when the air pressure within the alveoli exceeds atmospheric pressure, air is blown from the lungs (expiration).