How red blood cell aid in respiration?

Answer 1

When the blood goes around the body, the red blood cells have to unload all these oxygen molecules at places where they are needed, such as at muscle cells carrying out respiration.

In the lungs, there's a high concentration of oxygen, relatively low temperature, and less acidic. In such a condition, a red blood cell automatically absorbs oxygen.

In the tissues, where respiration is carried out, it's relatively warmer, lower in oxygen concentration and is likely to be more acidic due to a higher concentration of carbon dioxide. Here, the cell is more likely to lose the oxygen. Without any oxygen molecules in the cell, it appears dull red. The pigment inside the cell is now called deoxyhaemoglobin. And the cell is quickly transported back to the lungs to be reloaded with oxygen.

Answer 2

Red blood cells aid in respiration by running through the lungs and getting oxygen and transporting it through the body to aid aerobic respiration.