NEET BIOLOGY

Detailed explanation-1: -We breathe in oxygen and some of this carbon dioxide. When we exhale, we breathe out less oxygen but more carbon dioxide than we inhale. The carbon we breathe out as carbon dioxide comes from the carbon in the food we eat.

Detailed explanation-2: -The human breathing mechanism actual revolves around CO2, not oxygen. Without carbon dioxide, humans wouldn’t be able to breathe.

Detailed explanation-3: -Apart from gas, carbon dioxide may also occur in liquid and solid states. Dry ice is a frozen carbon dioxide.

Detailed explanation-4: -CO2 is transported in the bloodstream to the lungs where it is ultimately removed from the body through exhalation. CO2 plays various roles in the human body including regulation of blood pH, respiratory drive, and affinity of hemoglobin for oxygen (O2).