Question

Describe the steps by which oxygen moves from the environment to cells in the body and carbon dioxide moves from cells to the environment.

Answer 1

Oxygen is inhaled into the lungs for gaseous exchange, to occur between the blood and the alveoli, where oxygen diffuses into the blood; then, binding to haemoglobin of the red blood cells, which is carried away to cells in the body for respiration and CO2 diffuses out of the blood, to be exhaled.

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