EVERYDAY SCIENCE

Detailed explanation-1: -Oxygen molecules attach to red blood cells, which travel back to the heart. At the same time, the carbon dioxide molecules in the alveoli are blown out of the body the next time a person exhales. Gas exchange allows the body to replenish the oxygen and eliminate the carbon dioxide.

Detailed explanation-2: -Humans take in oxygen and give out carbon dioxide.

Detailed explanation-3: -Once in the lungs, oxygen is moved into the bloodstream and carried through your body. At each cell in your body, oxygen is exchanged for a waste gas called carbon dioxide. Your bloodstream then carries this waste gas back to the lungs where it is removed from the bloodstream and then exhaled.

Detailed explanation-4: -Haemoglobin molecules inside red blood cells pick up and carry the oxygen. These oxygen-rich cells travel in the blood vessels from the lungs to the left side of the heart. The blood is then pumped around the body. Red blood cells are adapted for the transport of oxygen.

Detailed explanation-5: -In blood, oxygen and carbon dioxide are carried by RBC and blood plasma. 97% of oxygen is transported by RBC and the rest of the 3% is by the plasma. In the RBC, hemoglobin (respiratory pigment) is found that binds the oxygen and form oxyhemoglobin. 70% of the carbon dioxide is carried by RBC.