Atlas One · Host Biology · Scale 06 — Organ

Placenta

Temporary hemochorial organ of eutherian mammals; trophoblast-derived. Mediates gas/nutrient exchange, fetal waste removal, hormone synthesis (hCG, progesterone, hPL), and immunological tolerance via HLA-G. Failure causes pre-eclampsia and IUGR.

Also known as: placenta, afterbirth, chorionic villi, trophoblast, hemochorial placenta

Scale 06 — OrganScale
draftStatus
2026-06-06Last Reviewed
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placenta

Placenta

Temporary hemochorial organ of eutherian mammals; trophoblast-derived. Mediates gas/nutrient exchange, fetal waste removal, hormone synthesis (hCG, progesterone, hPL), and immunological tolerance via HLA-G. Failure causes pre-eclampsia and IUGR.