Answers

2015-08-24T21:58:37+05:30
Upper two chambers - auricles
lower to chambers - ventricles.
 here, atria fill 1st, then contract at the same time, squeezing the blood into the ventricles. Then the ventricles make a much bigger contraction -also together- sending the blood out to the lungs to get oxygen, and to the rest of the body.
thank u . comment for changes to answer better next time.
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2015-08-25T20:43:25+05:30
Two chambers (right atria and ventricle)are to collect oxygenated blood  and from lungs And send deoxygenated blood to lungs.another chambers sends oxygenated blood to all body parts and collects deoxyblood from all body parts
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