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Chapter 4 Termz
Pregnancy
| Term | Definition |
|---|---|
| Cell | The smallest unit of life that is able to reproduce itself. |
| Sperm | The male sex cell. |
| Ovum | The female sex cell; also called the egg. |
| Conception | The union of the ovum and sperm cells. |
| Zygote | The single cell formed at conception; also called a fertalized egg. |
| Fallopian Tubes | Two hollow tubes that connect to the uterus and have fingerlike 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 in a person unless both genes for the trait are inherited. |
| Multiple Pregnancy | Pregnancy in which two or more babies develop. |
| Fraternal | Term describing children from multiple pregnancies who develop from two ova and differ in genetic makeup. |
| Chorion | Membrane that surrounds the baby in the uterus. |
| Identical | Term describing children from multiple pregnancies who develop from one fertalized ovum and have the same genetic makeup. |
| Prenatal Development | The development that takes place between conception and birth. |
| Germinal Stage | The first stage of prenatal development, which lasts about two weeks after conception. |
| Amnion | A fluid-filled sac that surrounds the baby in the uterus. |
| Placenta | An organ filled with blood vessals that nourishes the baby in the uterus. |
| Umbillical Chord | The chord that connects the baby to the placenta. |
| Embryonic Stage | The second stage of prenatal development, which lasts about six weeks. |
| Embryo | Term used to describe a baby in the embryonic stage of development. |
| Cartiladge | Soft, elastic, flexible tissue that provides a structure for the body. |
| Fetal Stage | The third stage of pregnancy, lasting from about nine weeks after conception until birth. |
| Fetus | Term used to describe a baby in the fetal stage of development. |
| Quickening | Movements of the fetus that can be felt by the mother. |
| Age of Viabilitiy | The age at which most babies could survive if they were born. (28 week of pregnancy.) |