Looking at the outside of the heart, you can see:
- that the heart is made of muscle. The strong muscular walls contract (squeeze), pumping blood to the arteries.
- the major blood vessels that enter the heart:
- aorta
- superior vena cava
- inferior vena cava
- pulmonary artery takes oxygen-poor blood from the heart to the lungs
- pulmonary vein -- brings oxygen-rich blood from the lungs to the heart
- the coronary arteries
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