ANATOMY

Detailed explanation-1: -We breathe in air from the atmosphere which is a mixture of all gases. The lungs absorb oxygen during inhalation and expel carbon dioxide during exhalation. The air that is exhaled out is also a mixture of gases but it is rich in carbon dioxide.

Detailed explanation-2: -Carbon dioxide is made in our bodies as cells do their jobs. The lungs and respiratory system allow oxygen in the air to be taken into the body, while also letting the body get rid of carbon dioxide in the air breathed out.

Detailed explanation-3: -Explanation: 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 dioxide is dissolved in the blood, carried to the lungs by the circulation, and breathed out.