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小 發表於 2016-1-16 05:27 PM (第 2995 天)
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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