Question

multiple choice question
as blood circulates, it transports inhaled ____ from the lungs to body cells and ____ from body cells to the lungs to be exhaled.
nitrogen; carbon dioxide
carbon dioxide; oxygen
oxygen; nitrogen
oxygen; carbon dioxide

Explanation:

During respiration, oxygen is inhaled into the lungs and then transported by blood to body - cells for cellular respiration. Carbon - dioxide, a waste product of cellular respiration in body cells, is transported by blood back to the lungs to be exhaled.

Answer:

oxygen; carbon dioxide