Biology / Unit 13 Bio 3347 short lesson, about 20 seconds
Placenta Structure and Function
Captions available
The idea
The placenta forms from fetal and maternal tissue after implantation and exchanges gases, nutrients, and waste between fetal and maternal blood without the two mixing.
In practice
Oxygen and nutrients diffuse from maternal blood across the placental barrier into fetal circulation.
Where people slip
This entry names an exchange-organ 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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