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The Endowment for Human Development
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The Heart in Action


4 weeks, 4 days

From The Biology of Prenatal Development.Buy Now

Script: 心臟一般心跳 每分鐘113次。

注意每次搏動 血液進入和離開心室時 心臟顏色的變化。

在出生之前, 心臟搏動5千4百萬次, 在80年生命中 搏動超過32億次。

All ages referenced to fertilization, not last menstrual period.
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Body Cavity Formation
Body Cavity Formation
Amniotic Fluid
Amniotic Fluid
The Heart in Action
The Heart in Action
The Limbs Bud
The Limbs Bud
Transparent Skin
Transparent Skin
Cerebral Hemispheres
Cerebral Hemispheres
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