Examples of placenta in the following topics:
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- Labor and birth are divided into three stages: the dilation of the cervix, the delivery of the baby, and the expulsion of the placenta.
- Labor is the physical effort of expulsion of the fetus and the placenta from the uterus during birth (parturition).
- At the same time, the placenta releases prostaglandins into the uterus, increasing the contractions.
- This is necessary for the baby and placenta to be expelled during birth.
- The last stage is the passage of the placenta after the baby has been born and the organ has completely disengaged from the uterine wall, usually within a few minutes.
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- Eutherian mammals are sometimes called placental mammals because all species possess a complex placenta that connects a fetus to the mother, allowing for gas, fluid, and nutrient exchange.
- While other mammals possess a less complex placenta or briefly have a placenta, all eutherians possess a complex placenta during gestation.
- Red foxes are eutherian (placental) mammals because the mothers nourish their young via a placenta during fetal development.
- The placenta enables a mother to exchange gases, fluids, and nutrients with the growing embryos.
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- As the trimester progresses, the outer layer of the embryo begins to merge with the endometrium and the placenta forms.
- This organ takes over the nutrient and waste requirements of the embryo and fetus, with the mother's blood passing nutrients to the placenta and removing waste from it.
- Some of the mother's immunoglobulins will pass through the placenta, providing passive immunity against some potential infections.
- The placenta will continue functioning up through the delivery of the fetus.
- This fetus is just entering the second trimester, when the placenta takes over more of the functions performed as the baby develops.
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- In mammals, membranes that are homologous to the extra-embryonic membranes in eggs are present in the placenta.
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- These stem cells can become any tissue in the body, excluding a placenta.
- Only cells from an earlier stage of the embryo, known as the morula, are totipotent, able to become all tissues in the body and the extraembryonic placenta.
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- In viviparity, the young develop within the female, receiving nourishment from the mother's blood through a placenta.
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- The trophoblast will contribute to the placenta and nourish the embryo.
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- For example, antibodies circulating in a pregnant woman's body move across the placenta into the developing fetus.