flow of deoxygenated bloodblood flow of oxygenated bloodsystolediastolehow does blood pump out of the
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heart?
what is open during systole?
what is closed during systole?
what causes the S1 or "lub" sound?
how does the heart fill up with blood?
what is open during diastole?
what is closed during diastole?
what causes the S2 or "dub" sound?
why can you not feel heart beat?
pericardium
left coronary circulation
what does the
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