Summary:
- Therian mammals are divided into two groups: placental mammals and marsupial mammals.
- Each group has a somewhat different reproductive strategy.
- The female reproductive system of all therian mammals is similar to that of humans.
- The uterus is a pouch-like, muscular organ.
- Muscular contractions of the uterus push the offspring out during birth.
- The vagina is a tubular passageway through which the embryo or fetus leaves the mother’s body.
- The placenta allows the exchange of gases, nutrients, and other substances between the fetus and mother.