What causes your body to inhale and exhale air into your lungs?

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I believe that the pressure from the diaphragm causes our lungs inflate, thus we inhale and when the diaphragm deflates, it makes us exhale. ---------------------------------------------------------------------
As your diaphragm or intercoastal muscles contract the size of the lungs increases. This creates a pressure difference between your lungs and the surrounding atmosphere. By increasing the size of the lungs you create a low pressure environment in the lungs by expanding the same amount of gas to a larger area. this pressure difference doesn't have to be much 1mmhg is more then enough, the main thing is just that you need a difference in preasure. Air flows from high preasure to low preasure, so by decreasing the preasure in the lungs air flows into the lungs. as you breath out you make the lungs smaller by relaxing the muscles and diaphragm, making the volume in the lungs decrease, thus increasing the preasure and moving the air from inside the lungs out to the surrounding atmosphere.
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What is exhaled air and inhaled air?

Exhaled air - is the carbon dioxide that we breath out as a product of cellular respiration. Inhaled air is the oxygen we take in that is required for the process of cellular

Why do your lungs inhale and exhale?

so you can get oxygen in you body Lungs inhale to supply the body with oxygen, they exhale to dispose of poisonous gasses such as carbon dioxide.

When you exhale but dn't delibirately inhale why does air still flow into your lungs?

Because air diffuses from high pressure to low pressure, when we breath we aren't really "sucking" air in, our diaphragm lowers and our ribcage extends allowing our lungs to "