PSYB32H3 Study Guide - Reserpine, Morning Sickness, Phocomelia

69 views12 pages
School
Department
Course

Document Summary

Prenatal development and birth: the ovum, or egg, once released from the mother"s ovaries, lives only about three to five days. Prenatal development takes 38 weeks or approximately 9 months. During which the sperm fertilizes the ovum, now referred to as zygote or fertilized egg, which then proceeds down the mother"s fallopian tube and implants in the wall of the uterus. The embryo also becomes recognizable as a tiny human being. From time of fertilization until the end of this period, the infant increases 2 million percent in size. Placenta and the umbilical cord transmit oxygen and nutrients to the infant and remove carbon dioxide and waste products from it, but they do not permit direct exchange of blood. In about the fourth or fifth week of gestation, the neural folds begin to close. End of the embryo growing period of the embryo, the growing organism"s face and features are delineated, and fingers, toes, and external genitalia are present.