trophoblasts
type: Concept
broader: placenta

placenta
definition: Physically, the placenta is a membranic sac in which a human fetus develops. It is a vehicle by which oxygen, nutrients, and blood necessary for the baby's development are transmitted from mother to child. [Source: Encyclopedia of African Religion; Placenta]
narrower: trophoblasts
broader: embryonic structures
type: Concept

embryonic structures
type: Concept
narrower: placenta

concepts
type: Collection
type: ConceptGroup
member: placenta