In the lungs, _______.

a) both oxygen and carbon dioxide enter the blood
b) oxygen enters the blood while carbon dioxide leaves the blood
c) carbon dioxide enters the blood while oxygen leaves the blood.
d) both oxygen and carbon dioxide leave the blood.


Ans: b) oxygen enters the blood while carbon dioxide leaves the blood

Biology & Microbiology

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A) mature in the bone marrow. B) circulate in low numbers in the blood. C) produce antibodies. D) function in helping other immune cells.

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