The Reproductive System Vocabulary 1. reproductive system – the organ system that enables humans and other animals to reproduce. 2. sperm – a male sex cell. 3. egg – a female sex cell. 4. fertilization - the process in which a sperm cell unites with an egg cell. 5. testes – the male reproductive organs that produce sperm. 6. hormones - a chemical made in one part of the body that affects the activities of cells in other parts of the body. 7. ovary – the female reproductive organ that produces eggs. 8. fallopian tube – the organ of the female reproductive system that transports eggs from an ovary to the uterus. 9. uterus – the organ of the female reproductive system that holds and nourishes a growing fetus. 10. vagina – the structure of the female reproductive system through which a baby exits the mother’s body cavity during birth, also called the birth canal. 11. zygote – a new cell formed when an egg cell is fertilized. 12. placenta – a fluid-filled organ through which materials are exchanged between the mother and the developing offspring of humans and other mammals.