Physiology 3120 Lecture Notes - Lecture 5: Zona Pellucida, Corpus Luteum, Inner Cell Mass
21 Mar 2017
School
Department
Course
Professor
Document Summary
Ovum viable for 48 hours, sperm viable for 1-3 days. Conception division within zona tight hatching blastocyst leaves protective shell of zona pellucida has to do that so it can implant. When implantation progesterone rises, estrogen decreases (contractions decrease) Nutrients through blood stream to uterus, simple diffusion across membrane of. Needs to be in certain position to implant, blastocyst leave zona pelluida. Needs to get nutrient supply and stable position. Number of proteins secreted from leading edge of cell?? to degrade matrix of endometrium seeking out blood supply viewed like stem cells), leading cells (syncytiotrophoblasts- multinucleated, digestive cells of invading fetus to be) Blue area differentiates into two types of cells inner layer (cytotrophoblast these are. Some of the other nutrients needed are oxygen (diffusion), sugar (transport), amino acids (active transport), fatty acids, hormones. Further differentiation trophoblasts continue to support.
