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WHAT HAPPEN WHEN VENTILATION OCCURS IN HUMAN

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WHAT HAPPEN WHEN VENTILATION OCCURS IN HUMAN

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Respiration is achieved through the movement of the diaphragm between the thoracic cavity and the abdominal（腹部） cavity
Inhale, the diaphragm moves downward, the chest volume becomes larger, the lungs pressure below atmospheric pressure, the external air pressure to the air into the lungs
During exhalation（呼气）, the diaphragm moves upward, the volume of the thoracic cavity becomes smaller, and the internal pressure is greater than the outside

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Ventilation is a movement when we are breathing in our lungs. And give oxygen to the whole body.

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

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Both of these actions decrease the volume inside the thorax, causing the pressure inside the thorax to increase.

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The muscle in the diaphragm 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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This lowers the ribs downwards and inwards.

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The internal intercostal muscles contract and the external intercostal muscles relax.

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since atmospheric pressure is greater, air moves into the lungs and they inflate（膨胀）.

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both of these actions increase the volume inside the throat, causing the pressure inside the thorax to decrease.

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at the same time, the diaphragm contrasts and flattens.

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The external(外部的；外部） intercostal muscles contrast and the internal intercostals muscles relax, raising the ribs upwards and outwards.