The heart is surrounded by fibroserous sac, the pericardium. This is composed of two layers and anchors it to the surrounding structures

The heart is surrounded by fibroserous sac, the pericardium. This is composed of two layers and anchors it to the surrounding structures

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Great visuals.  Coronary artery supply and corresponding MIs | Sketchy Medicine
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Heart Blood Flow Path | ... blood passes through the heart twice for the body to be supplied once

Heart Blood Flow Path | ... blood passes through the heart twice for the body to be supplied once

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Looking at the outside of the heart, you can see the heart is made of muscle. The strong muscular walls contract (squeeze), pumping blood to the arteries.

Looking at the outside of the heart, you can see the heart is made of muscle. The strong muscular walls contract (squeeze), pumping blood to the arteries.

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The Quick and Dirty Guide to Cardiology II: Coronary Circulation - MedicTests.com

The Quick and Dirty Guide to Cardiology II: Coronary Circulation - MedicTests.com

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