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[Bio] inhalation一問

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inhalation一問

Which of the following sequences of events will occur when a person
inhales while he is asleep?
A. The diaphragm muscles contract → atmospheric air rushes into the
lungs → the lungs dilate
B. The intercostal muscles contract → atmospheric air rushes into the
lungs → the lungs dilate
C. The diaphragm muscles contract → the lungs dilate → atmospheric
air rushes into the lungs
D. The intercostal muscles contract → the lungs dilate → atmospheric
air rushes into the lungs

唔係both  diaphragm  and  intercostal muscles  will contract during inhalation咩?
   

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引用:
原帖由 qq10708 於 2011-8-16 01:57 PM 發表
Which of the following sequences of events will occur when a person
inhales while he is asleep?
A. The diaphragm muscles contract → atmospheric air rushes into the
lungs → the lungs dilate
B. Th ...
訓左覺只集中用diaphragm

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回覆 1# qq10708 的帖子

when a person is asleep, due to gravity, it is difficult to lift up the rib cage by the contraction of the intercostal muscles.
moreover, less oxygen is needed for respiration to release energy during sleeping, thus although only the diaphragm contracts, the amount of oxygen inhaled can still support our body activities.

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thz a lot

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問得咁撚偏,邊有人識呀

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