PATHOLOGY

Detailed explanation-1: -Carbon dioxide (CO2) is a waste product of cellular metabolism. You get rid of it when you breathe out (exhale). This gas is transported in the opposite direction to oxygen: It passes from the bloodstream – across the lining of the air sacs – into the lungs and out into the open.

Detailed explanation-2: -As oxygen crosses over into the capillaries, the red blood cells capture it, while the carbon dioxide is unloaded into the lungs to be removed. The oxygen-rich hemoglobin is transported throughout the body and the lungs exhale the carbon dioxide.

Detailed explanation-3: -Your diaphragm tightens and flattens, allowing you to suck air into your lungs. To breathe out (exhale), your diaphragm and rib cage muscles relax. This naturally lets the air out of your lungs. To get the oxygen your body needs, you inhale air through your mouth and nose.