PSYCH 3400 Lecture Notes - Lecture 8: Human Chorionic Gonadotropin, Blastocyst, Placenta
Document Summary
Long period of time (goes until week 8: weeks 3 through 8. Migration: movement of newly formed cells from inside of the blastocyst to some where else. Differentiation: the process by which stem cells become specialized in both structure and function. Stem cell: embryonic cells that can develop into any type of body cell. Time line: 4 weeks- heartbeat, 5. 5 weeks- nose and mouth fully formed, 9 weeks- eyes and ears; spontaneous movements. Proximodistal sequence: the development principle that growth occurs from the most interior parts of the body outward. Cephlocaudal sequence: the developmental principle that growth occurs in a sequence from head to toe. Pregnancy hormones hcg: a hormone produced by a portion of the placenta following implantation. Estrogen: a hormone (linked to morning sickness) that improves vascularization, the transfer or nutrients, and supports the developing baby. Progesterone: a hormone that causes that causes a loosening of ligaments and joints.
