| A | B |
|---|
| Amniotic sac | thin, liquid-filled, protective membrane that forms around the embryo |
| Embryo | fertilized egg that has attached to the wall of the uterus |
| Fetal stress | can occur during the birth process or after birth as infant adjusts from a water, dark, constant-temperature environment to its new environment |
| Fetus | in humans, a developing baby after the first 2 month of pregnancy until birth |
| Hormone | in humans, chemical produced by the endocrine system, released directly into the bloodstream by ductless glands; affects specific target tissues, and can speed up or slow down cellular activities |
| Menstrual cycle | hormone-controlled monthly cycle of changes in the female reproductive system that includes the maturation of an egg and preparation of the uterus for possible pregnancy |
| Ovary | in humans, female reproductive organ that produces eggs and is located in the lower part of the body |
| Ovulation | monthly process in which an egg is released from an ovary and enters the oviduct, where it can become fertilized by sperm |
| Pregnancy | period of development – usually about 38 to 39 weeks in female humans – from fertilized egg to birth |
| Semen | mixture of sperm and a fluid that helps sperm move and supplies them with an energy source |
| Sperm | haploid sex cell formed in the male reproductive organs; in humans, male reproductive cells produced in the testes |
| Testes | male organ that produces sperm and testosterone |
| Uterus | in female humans, hollow, muscular, pear-shaped organ where a fertilized egg develops into a baby |
| Vagina | muscular tube that connects the lower end of female’s uterus to the outside of the body; the birth canal through which a baby travels when being born |
