placenta

(noun)

A vascular organ in mammals, present only in the female during gestation, that supplies food and oxygen from the mother to the fetus and passes back waste.

Related Terms

  • sudden infant death syndrome
  • zygote
  • fetal alcohol syndrome
  • teratogen

Examples of placenta in the following topics:

  • Environmental Impacts on Prenatal Development

    • When the zygote attaches to the wall of the uterus, the placenta is formed.
    • The placenta provides nourishment and oxygen to the fetus.
    • Most everything the mother ingests, including food, liquid, and even medication, travels through the placenta to the fetus—hence the common phrase that a mother “eats for two.”
    • Alcohol and most drugs cross the placenta and affect the fetus.
    • Smoking tobacco is also considered a teratogen because nicotine travels through the placenta to the fetus.
  • Prenatal Brain Development

    • During the germinal stage, the cells necessary for the placenta, umbilical cord, and amniotic fluid will differentiate to form the embryo.
    • Now blood vessels grow, forming the placenta.
    • The placenta is a structure connected to the uterus that provides nourishment and oxygen from the woman's body to the developing embryo through the umbilical cord.
    • During the germinal stage of prenatal development, the cells necessary for the placenta, umbilical cord, and amniotic fluid will differentiate to form the embryo.
  • Intellectual Disabilities

    • This syndrome is caused when alcohol crosses the barrier of the placenta in a pregnant woman and damages the developing brain of the fetus.
  • The Endocrine System

    • Progesterone: produced in sex organs, or the placenta when pregnant; can support pregnancy and has other regulatory functions.
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