Respiratory system

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Oxygen goes in through mouth or nose and into larynx, and then into the trachea.

Trachea goes into two bronchi, one in each lung.

The bronchus split into narrow tubes called bronchioles

Alveioli are at the end of bronchioles, and the alveioli are covered in capillaries

In capillaries, oxygen diffuses in and carbon dioxide diffuses out of the lungs and is removed from the body during exhalation.

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Lungs during breathing

The diaphragm is the muscle underneath the lungs

During exhalation, diaphragm relaxed

During inhalation, diaphragm contracts and flattens out allowing lungs to open up

The larger the volume, the lower the pressure

Pressure gradient goes from high to low and oxygen flows down the pressure gradient

When pressure in lungs is lower than the pressure outisde the lungs, air flows in

When pressure in lungs is higher than the pressure outside the lungs, deoxygenated air flows out

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