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Chapter 51

Section 3

TermDefinition
in mammals, the process of carrying young from fertilization to birth gestation
the modified blastula stage of mammalian embryos blastocyst
the process by which the newly fertilized egg in the blastocyst stage embeds itself in the lining of the uterus implantation
the period of time between implantation and birth pregnancy
one of the three equal periods of about 12 weeks into which the human gestation period is divided trimester
an organism in an early stage of development of plants and animals; in humans, a developing individual is referred to as this from the second through the eighth week of pregnancy embryo
the sac formed by the amnion amniotic sac
fingerlike projections of the chorion that extend into the uterine lining chorionic villus
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 placenta
the structure that connects an embryo and then the fetus to the placenta and through which blood vessels pass umbilical cord
a hormone that is secreted by the placenta and that stimulates ovulation and secretion of progesterone or testosterone human chorionic gonadotropin (HCG)
a developing human during the period from the eighth week after fertilization until birth fetus
the process by which the fetus and the placenta come out of the uterus labor
the remains of the placenta and the membranes, which are expelled from the mother's body following birth afterbirth
Created by: fasolak16
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