Question

how do lungs excrete co2

Answer 1

After intaking o2 they aerobic respiration process occurs and releases co2

Answer 2

when we take oxygen it goes to our lungs and when we exert co2 so the lungs passes the oxygen to the heart and hard passes the oxygen to our blood and the blood goes through breakdown of glucose and convert oxygen into Co2 and form energy and goes to heart and heart the sure to goes to lungs and it exerted co2 from our nose