portage learning biod 121 module 6

The first stage of gestation, during which rapid cell division occurs is known as the blastogenic stage. organ system development occurs from about week two through the eighth week and is called the embryonic stage. The fetal stage occurs from week nine to the end of the pregnancy and is a period of growth . All pregnancies are divided into three equal time periods, known as trimesters, each lasting approximately 13-14 weeks. A baby born after the thirty seventh week of pregnancy is consid...