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http://becuo.com/inspiration-and-expiration-diagram

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

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When step 1 and step 2 happen in the same time it will decrease the volume of the thorax and pressure inside the thorax to increase the thorax.

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The muscle in the diaphragm relaxes and it expand until to pressure from the organs below.

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The internal intercostal muscle contract and the external intercostal muscle relax. and cause ribs downward and inward

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nothing

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When air goes into the lungs, it will expand because of the atmospheric pressure.

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When Step 2 and Step 3 both happen, it will cause the volume in the throne decrease and the pressure inside of the thorax.

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In the same time, the digraph contract and smooth.

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When the air come to the lungs the external intercostal contract at the same time the internal intercostal relax and make ribs go the upward and outward.

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The air breath in through nose to trachea to your lungs

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Ventilation is means that the breath in and breath out happens in the human body, and give oxygen to the whole body.

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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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We will get enough oxygen that we need through the breath in and excretion the waste like carbon dioxide through breath out form the body.