Which statement best describes the role of the lung in gas exchange?

A It produces oxygen as a waste product of cellular respiration
B It provides carbon dioxide to the capillaries.
C It extracts oxygen from the atmosphere for use by body cells.
D It takes in oxygen from the bloodstream.

C It extracts oxygen from the atmosphere for use by body cells.

Explanation:

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it also supports my hypothesis. if you rest first you can squeeze the clothespin more times. from the data i collected the average of the eight people concluded exercise makes your muscles more fatigued and less able to squeeze the clothespin compared to resting before squeezing.