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What happens to cause air to be exhaled from the lungs?

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the diaphragm relaxes and that causes the ribcage to compress (get smaller) this pushes air out, and you have exhailed
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What causes your body to inhale and exhale air into your lungs?

I believe that the pressure from the diaphragm causes our lungs inflate, thus we inhale and when the diaphragm deflates, it makes us exhale. -------------------------------

What happen to your lungs as you exhale air?

When you breathe out, or exhale, your diaphragm relaxes and moves upward into the chest cavity. The intercostal muscles between the ribs also relax to reduce the space in the