Explain the differences among a dikaryon zygote, a zygote, a morula and a blastocyst. Recognize that the implanted blastocyst secretes human gonadotropin, which prolongs the life of the corpus luteum and therefore maintains progesterone secretion. Describe the process of implantation and development of the placenta, the substances that move across it and the role of the placenta in maintaining the fetus.
Life Cycle in the Human Body: The Reproductive System
- Discuss the role of hormones in the reproductive system.