coronary sinus carry the deoxygenated blood away from the heart but how the blood is deoxygenated in the heart??
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Heart is called the blood bank. It itself doesn't use the blood that is poured into its chambers. But food and oxygen ghas to be supplied to cardiac muscles to for its active functioning so coronary circulation fulfill the need of it. Cardiac muscle get oxygenated blood from coronary artery and deoxygenated blood from it is taken away by coronary sinus.
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