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The air inside our lungs moves in and out because of the movement of the diaphragm as well as the ribs and chest cavity. When we breath in our ribs push out and our diaphragm contracts to create a larger cavity inside your lungs. This causes an area of low pressure which therefore forces air down our trachea into our lungs. When we breath out the opposite happens (diaphragm relaxes and ribs pull in) which creates a smaller cavity in our lungs what therefore forces the air out of our lungs once respiration has taken place.

It should be noted that during inspiration as the intercostal muscles expand the rib cage and the diaphragm (more important for volume change) moves inferiorly, this creates negative pressure in the thoracic cavity relative to the atmospheric pressure.. consequently due to the pressure gradient, air can move into the lungs via the trachea. The negative pressure that is caused here is the main propellent of air. Whereas expiration, when the diaphragm and intercostal muscles return to resting position, thus restoring pressure to its normal levels is a passive process. The pressure gradient returns to normal and air can be expired.

The importance of the negative pressure created by the intrapleural cavity cannot be stressed enough.

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13y ago
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13y ago

The diaphragm, below the lungs, contracts causing a lower pressure in the lungs, and pulls the air in.

To exhale, the diaphragm relaxes, and the chest muscles contract, forcing the lungs to be smaller and the air to be pushed out.

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10y ago

As the diaphragm and intercostal muscles relax the volume of the lungs decreases. As intrapulmonary volume goes down, intrapulmonary pressure goes up. When the pressure inside the lungs exceeds the atmospheric pressure outside the lungs, air flows out and we exhale.

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15y ago

the diaphragm relaxes and that causes the ribcage to compress (get smaller) this pushes air out, and you have exhailed

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7y ago

The diaphragm rises. CO2 is forced out. With freeing the CO2 from Hgb and the lungs, the Hemoglobin can now pick up new oxygen molecules. The volume of the thoracic cavity decreases.

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11y ago

your muscles tightening and loosening

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Q: What causes air to enter and leave the lungs?
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What process causes water to leave the ocean and enter the air?

Evaporation.


How air body enter and leave the body?

it goes through the trachea/windpipe into your lungs and back out


Does air enter or leave your lungs when you talk?

When we talk, we tend to let small bits of air out. We proceed to get more oxygen in our lungs when we start pausing or breathing in between sentences and coversations.


What is the trachea and what is its function?

The organ between the larynx and the bronchy and transport air in and out into the lungs.


Where does air enter the body?

lungs


Where in a mammal's body does the oxygen enter the bloodstream?

It enter when you breathe. You let go of Carbon in your body when you breathe out, and let fresh air or oxygen enter your body when you breathe in.


What human action causes the lungs to become filled with air?

breathing is the human action that causes the lungs to be filled with air.


Which organs does air leave the body?

Air leave the body from organs called the lungs.


What does air enter through?

Air enters through the trachea and into the lungs.


What causes air to enter the lungs?

The diaphragm, below the lungs, contracts causing a lower pressure in the lungs, and pulls the air in. To exhale, the diaphragm relaxes, and the chest muscles contract, forcing the lungs to be smaller and the air to be pushed out. While having sex, this happens faster as we need more energy. ah! ah! ah! oh! oh!oh!


Where in one of two places air enter body?

Air can enter the body by the mouth or the nose. Air then goes down the windpipe to the lungs where it can enter the bloodstream.


What structures of the respiratory system prepare air for entry into the lungs?

The nose and trachea prepare the air to enter the lungs. This is because the air first passes through these things, then into the lungs.