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Vocab 51.3
Gestation
Term | Definition |
---|---|
Gestation | In mammals, the process of carrying young from fertilization to birth |
Blastocyst | The modified blastula stage of mammalian embryos |
Implantation | The process by which the newly fertilized egg in the blastocyst stage embeds itself in the lining off the uterus |
Pregnancy | The period of time between implantation and birth |
Trimester | One of the three equal periods of about 12 weeks into which the human gestation period is divided |
Embryo | An organism in an early stage of development of plants and animals; in humans, a developing individual is referred to as an embryo from the second through the eighth week of pregnancy |
Amniotic Sac | The sac formed by the amnion |
Chorionic Villi | Fingerlike projections of the chorion that extend into the uterine lining |
Placenta | The structure that attaches a developing fetus to the uterus and that enables the exchange of nutrients, wastes, and gases between the mother and the fetus |
Umbilical Cord | The structure that connects an embryo and then the fetus to the placenta and through which blood vessels pass |
Human Chorionic Gonadotropic | A hormone that is secreted by the placenta and that stimulates ovulation and secretion of progesterone or testosterone |
Fetus | A developing human during the period from the eight week after fertilization until birth |
Labor | The process by which the fetus and the placenta come out of the uterus |
Afterbirth | The remains of the placenta and the membranes, which are expelled from the mother;s body following the birth |