Pregnancy and Development
Expanded Notes: Biological Foundations of Pregnancy and Development of a New Organism BY PROFESSOR JONES H.M 1. Introduction In the biological foundation of pregnancy, the development of a new human organism is explained in stages. These stages are classified according to time , structure , and major physiological changes taking place after fertilization. Pregnancy begins biologically when a sperm cell fuses with an ovum , also called an egg cell. This fusion is called fertilization . The attached reproductive notes explain that fertilization often occurs in the ampulla , which is the middle part of the Fallopian tube, before the fertilized egg moves toward the uterus for implantation in the endometrium. After fertilization, the new organism does not immediately become a fetus. It passes through several stages: Zygote Morula Blastocyst Embryo Fetus Each stage has its own structure, function, and importance in the development of pregnancy. https:/...