3.Oxygen is absorbed through the walls of the a. Alveoli b. Lungs c. Sacs d. Bronchi​

Sagot :

Answer:

B. lungs

lungs inside the air sacs, oxygen moves across paper-thin walls to tiny blood vessels called capillaries and into your blood. A protein called haemoglobin in the red blood cells then carries the oxygen around your body.

Explanation:

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