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cardiovascular system
describe the changes during exercise
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That is very vague... what changes are you speaking of?  Im no doctor, but there are changes within all of the body's chemistry during exercise.  The muscles are working, the respiratory system is working harder becoming stronger, the brain is releasing all kinds of chemicals....  over all, our health is improving to some extent with exercise.
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1594482 tn?1297955571
hahaha... sounds like someone wants an easy answer... i suggest you "search" for it...
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way off the beaten track!, BC