Homework_ Respiration - 9A

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RESPIRATION

How breathing works

During breathing, air moves from areas of high pressure to areas of low pressure. When the pressure in the lungs is lower than the pressure in the atmosphere, air enters the airways. If the pressure in the lungs increases, air moves out of the lungs and is then exhaled.

Inhaling

The diaphragm and intercostal muscles between the ribs contract. As a result, the ribcage expands, creating a decrease in pressure, and air is drawn into the lungs.

Exhaling

After breathing in, the diaphragm and intercostal muscles relax and the ribcage contracts. Pressure inside the lungs increases and air moves out of the lungs in order to be exhaled.