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chapter 4
pregnancy
Term | Definition |
---|---|
cell | smallest unit of life that is able to reproduce itself |
sperm | male sex cell |
ovum | female sex cell; also called an egg |
conception | the union of the ovum and sperm cells |
zygote | the single cell formed at conception;also called a fertilized egg |
Fallopian tubes | two hollow tubes that connect to the uterus and have finger-like projections that reach toward each ovary. |
uterus | the organ in which the baby develops and is protected until birth. |
genetic factors | traits that are passed through the genes. |
chromosomes | threadlike structures that carry genes in living cells |
dominant traits | traits that always show in a person even if only one gene of the pair is inherited for that trait |
recessive traits | traits that typically do not show a person unless both genes for the trait are inherited |
multiple pregnancy | pregnancy in witch two or more babies develop |
fraternal | term describing children from multiple pregnancies who develop from two ova and differ in genetic make up |
Chorion | membrane that surrounds the baby in the uterus |
identical | term describing children from multiple pregnancies who develop from one fertilized ovum and have the same genetic makeup |
prenatal development | development that takes place between conception and birth |
germinal stage | first stage of prenatal development, which lasts about two weeks after conception |
amnion | fluid-filled sac that surrounds the baby in the uterus |
placenta | an organ filled with blood vessels that nourishes the baby in the uterus |
umbilical cord | the cord that connects the baby to the placenta |
embryonic stage | second stage of prenatal development which lasts six weeks |
embryo | baby in the embryonic stage of development |
cartilage | soft, elastic,flexible tissue that provides structure for the body |
fetal stage | third stage of pregnancy |
fetus | a baby in the fetal stage of development |
quickening | movements of the baby that can be felt by the mother |
age of viability | age where most babies could survive if they were born |