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[Bio] air pressure in the lungs

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air pressure in the lungs

https://www.flickr.com/photos/13 ... /dateposted-public/

At which of the following time is the volume of the lungs the smallest?
        A        1 s
        B        2 s
        C        3 s
        D        4 s

the answer is B. why? i chose C.
also what is difference between time 2s and 4s
   

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Mechanism of breathing:
Diaphragm and intercostal muscle contract.
Volume of lung increase.
Pressure of lung decrease and become lower than atmospheric pressure.
Air rushes in the lung.

姐係話當air pressure in lung < atmospheric pressure就係吸氣,掉返轉就係呼氣。
0s: 岩岩吸完氣,lung volume maximum
0-2s: 呼緊氣
2s: 岩岩呼完氣,lung volume minimum
2-4s: 吸緊氣
4s: 岩岩吸完氣,lung volume maximum

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smallest just after completion of exhalation

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