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About: Placentation     Goto   Sponge   NotDistinct   Permalink

An Entity of Type : umbel-rc:Embryology, within Data Space : dbpedia.org associated with source document(s)

Type: Thingwikidata:Q4936952anatomical structureembryologyumbel-rc:AnimalBodyPartumbel-rc:Embryology New Facet based on Instances of this Class

Placentation refers to the formation, type and structure, or arrangement of the placenta. The function of placentation is to transfer nutrients, respiratory gases, and water from maternal tissue to a growing embryo, and in some instances to remove waste from the embryo. Placentation is best known in live-bearing mammals (theria), but also occurs in some fish, reptiles, amphibians, a diversity of invertebrates, and flowering plants. In vertebrates, placentas have evolved more than 100 times independently, with the majority of these instances occurring in squamate reptiles.