explain how does the air from the lungs reach the atmosphere when a person breathes out ?

Question

hari5719 · Answer

@Abhisar      @ganeshie8

syedmohammed98 · Answer

inside the lungs there are air sacs presnt called alveoli surrounded by blood capillaries...the CO2(waste product) in his/her blood will move from the surrounding capillaries to the alveoli ... bcuz of concentration gradient ..this air containing the waste product (CO2) will move from the alveoli to the bronchi-oles  leading towards the windpipe ..and then expelled through mouth or nose.........i hope u get it ..