| Term | Definition |
|---|
| embryo | an organism in its early stages of development. for humans this is the first two months after conception. |
| fetus | the unborn young. for humans this is from 3 months to birth. |
| differentiation | the formation of different types of cells that carry out different function (cells become specialized) |
| blastula | the stage where the one celled zygote begins going through divisions by mitosis until a single layer of cells form a hollow ball is formed. |
| zygote | the fertilized ovum; produced by union of two gametes |
| gastrula | the two layered structure that the blastula pushes inward as development proceeds. |
| fertilization | fusion of the nuclear material of an egg and a sperm |
| fallopian tube | the oviduct. the tube through which the ovum is transported to the uterus. |
| ovaries, testis | reproductive organs |
| implantation | the organic process whereby a fertilized egg becomes implanted in the lining of the uterus |
| ovum, sperm | gametes |
| amnion | the fetal membrane that forms a fluid-filled sac around the embryo. |
| villi | fingerlike projections of the small intestinal mucosa that tremendously increase its surface area for absorption. |
| umbilical cord | a structure bearing arteries and veins connecting the placenta and the fetus. |
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