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 Hey
guys, you've made it to the heart!
 These
are a few things you should know about the heart:
- Your
heart is an organ made of cardiac muscle.
- Your
heart has four cavities called chambers
- The
two upper chambers are called the right and left atria
- The
two lower chambers are the right and left ventricles
- Blood
flows into the heart through the atrium and then out through the
ventricle
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