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.
o nitrogen; carbon dioxide
o oxygen; nitrogen
o carbon dioxide; oxygen
o oxygen; carbon dioxide

Explanation:

Blood picks up oxygen from the lungs during inhalation and transports it to body - cells for cellular respiration. During cellular respiration, carbon - dioxide is produced as a waste product, which is then transported by the blood back to the lungs to be exhaled.

Answer:

oxygen; carbon dioxide