Question

explain how the air is inhaled and exhaled

Answer 1

air enters our lungs through windpipe. within the lungs there are finger like structures called villis. these ,when we breathe ,these become fluffy and then we exale co2

Answer 2

when u breathe in, or inhale, your diaphragm contracts(tightens)and moves downward. this increases the space in ur chest cavity , into which your lungs expand. the intercostal muscles between ur ribs also help enlarge the chest cavity.they contract to pull your ribcage both upward and outward when u inhale .