| Term | Definition |
|---|
| How does pregnancy occur? | Sperm and ova must meet after or during intercourse |
| fertilization | the joining of the egg and sperm cell |
| implantation | attaching of the zygote to the uterine wall |
| zygote | fertilized egg |
| embryo | from the two cell stage through the 8th week of developement |
| twins | development of more then one baby from a single pregnancy |
| identical twins | single egg released from ovary and fertilized by one sperm: fertilized egg then splits into two embryos |
| fraternal twins | two eggs released from ovary and fertilized by two different sperm |
| conjoined twins | occur when a zygot fails to split completely during deelopment in the womb |
| amniotic sac | fluid filled sac that surronds and protects the embryo |
| placenta | membrane that forms on the wall of the uterus that links the mother and the developing fetus |
| fetus | from the 9th week until birth (weeks 10-12) |
| umbilical cord | ropelike structure attached to the placenta that forms between the mother and the fetus: contains blood vessels that exchange nutrients and waste. |
| sexual intercourse | penis is inserted into the vagina until ejeculation occurs |
| sperm | male sex cell |
| ova | female sex cell |
| ejaculation | the release of seman from the male reproductive organs |
Combine with other sets
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