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Elastic recoil of the alveoli helps to force air out of the lungs.

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The volume inside of the thorax will decrease, and the pressure of the thorax will increase.

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-The muscle in the diaphragm will relaxes, and it bulges up due to pressure from the organs below, for example the liver and stomach, and contraction of the abdominal muscles.

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-When we breath out oxygen, internal intercostal muscles will contract and the external intercostal muscles will relax and it will cause the ribs lowering downwards and inwards.

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The atmospheric pressure is higher, air moves into lungs and they inflate

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-Wether the diaphragm contracts or flattens, the volume inside of the thorax will increase, and ot will cause the pressure inside the thorax to decrease.

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-The diaphragm will also contracts and flattens.

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-When we breath in oxygen, external intercostal muscles will contract and internal intercostal muscles will relax and it will cause the ribs rising upwards and downwards.

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Circulatory system and respiratory system

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Circulatory system and respiratory system

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Hank Green老师以有趣的方式教你生物学!感谢感谢为视频提供翻译的志愿者@糖醋陈皮。

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When you body are doing ventilation, the gas exchange will occurring. The percentage of oxygen that we breath in is more than we breath out. The percentage of carbon dioxide is more when we breath out. Nitrogen remains the same because we don't need nitrogen to support our living. Water vapour will also be saturated when we breath out.