Ch.51 vocab
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
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| gestation | in mammals, the process of carrying young from fertilization to birth
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| blastocyst | the modified blastula stage of mammalian embryos
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| implantation | the process by which the newly fertilized egg in the blastocyst stage embeds itself in the lining of the uterus
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| pregnancy |
the period of time between conception and birth
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| trimester | pregnancy is divided into three equal periods
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| embryo | in humans, a developing individual is referred to as an embryo from the second through the eighth week of pregnancy
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| amniotic sac | the sac formed by the amnion
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| chorionic villus | fingerlike projections of the chorion that extend into the uterine lining (singular, chorionic villus)
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| 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
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| umbilical cord | the structure that connects an embryo and then the fetus to the placenta and through which blood vessels pass
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| human chorionic gonadotropin | a hormone that is secreted by the placenta and that stimulates ovulation and secretion of progesterone or testosterone (abbreviation, HCG)
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| fetus | a developing human from seven or eight weeks after fertilization until birth
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| labor | the process by which the fetus and the placenta come out of the uterus
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| afterbirth | the remains of the placenta and the membranes, which are expelled from the mother's body following birth
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