NEET BIOLOGY

Detailed explanation-1: -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-2: -In the human body, carbon dioxide is formed intracellularly as a byproduct of metabolism. CO2 is transported in the bloodstream to the lungs where it is ultimately removed from the body through exhalation.

Detailed explanation-3: -Human beings do exhale almost three billion tons of carbon dioxide annually, but the carbon we exhale is the same carbon that was “inhaled” from the atmosphere by the plants we consume.

Detailed explanation-4: -The carbon dioxide is dissolved in the blood, carried to the lungs by the circulation, and breathed out. Every living cell of our body carries out the energy-releasing process of respiration, where glucose (a simple sugar) is slowly “burnt” (oxidised) to give off carbon dioxide (excreted through the lungs) and water.

Detailed explanation-5: -The carbon dioxide diffuses out of the red blood cells, through the capillary walls, and into the alveolar spaces f exhaled.