Biology / Unit 13 Bio 3349 short lesson, about 20 seconds
Human Gestation: a Structural Mechanism
Captions available
The idea
Human gestation proceeds through stages in which the fertilized egg implants in the uterine wall, per Bio 3331, then builds organ systems this unit traces later.
In practice
Implantation must occur within about a week of fertilization or the embryo fails to connect.
Where people slip
This entry names a developmental-timeline mechanism only —
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
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