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The Maturing Heart

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Script: The 4-chambered heart is largely complete. On average, the heart now beats 167 times per minute.

Electrical activity of the heart recorded at 7 1/2 weeks reveals a wave pattern similar to the adult's.

All ages referenced to fertilization, not last menstrual period.

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The Maturing Heart

The External Ear

Hiccups & Startle Response

Joining Hands

Bone Formation

Eyes and Eyelids