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How is oxygen, carbon dioxide, and other waste gases exchanged in the lungs and body tissues?

Answer 1

Oxygen enters the body while we breathe in via alveoli,as they are connected with single celled thick blood capillaries.The oxygen diffuses .Also as we respire CO2 is difffused into the blood by the body tissues where it is carried to the lungs by the pulmonary artery to the lungs and out of the body.

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Answer 2

Grace Acocella

Oxygen is transported from the lungs to the body tissues through the bloodstream by binding to hemoglobin in red blood cells. Carbon dioxide, a waste product of cellular respiration, is transported from the tissues to the lungs in the bloodstream. In the lungs, oxygen diffuses into the blood while carbon dioxide diffuses out of the blood into the alveoli to be exhaled. This exchange occurs through diffusion across the thin membranes of the alveoli and capillaries.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.