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Cardiovascular System Anatomy and Physiology

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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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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Great visuals. Coronary artery supply and corresponding MIs | Sketchy Medicine

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Coronary Circulation Pathway | Coronary Circulation Coronary circulation