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Use the arrow keys to step through structures.

3D specimen · click a dot to exploreCor
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Learning is
an act of curiosity.

Keep exploring!
Under the microscope

Heart muscle up close

Compare organs

Heart vs. brain

Function animation

Pumps blood around your body

Did you know

Amazing facts

  • It beats roughly 2.5 billion times in an average lifetime, and starts before you are born.
  • Beats about 100,000 times
  • About the size of your fist
Where it works

Cardiovascular

Related organs

Cardiovascular