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2 answers

Very,simple when you do any kind of cardiovascular(means in the presence of oxygen) exercise you are using your heart and specially your lungs.

2006-10-11 05:11:29 · answer #1 · answered by lovelyredcuban 1 · 0 0

heart

2006-10-11 12:10:10 · answer #2 · answered by jenivive 6 · 0 0

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