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The Heart in Action

#021, Movie 1 of 10

4 weeks, 4 days

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Script:

The heart typically beats about 113 times per minute.

Note how the heart changes color as blood enters and leaves its chambers with each beat.

The heart will beat approximately 54 million times before birth and over 3.2 billion times over the course of an 80-year lifespan.
From The Biology of Prenatal Development.Buy Now
    All ages referenced to fertilization, not last menstrual period.
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