LING 200 Lecture Notes - Lecture 2: Zona Pellucida, Conjoined Twins, Morula
Document Summary
Specialized to create interface between maternal blood supply and developing embryo. Which has two arteries and one vein: vein carries nutrient rich blood from placenta to embryo. Arteries take waste and deoxygenated blood to placenta. Fluid is for shock absorbance: gastrulation: generation of three distinct cell layers. Additionally, the pancreas, thyroid, bladder and distal urinary tract and liver are derived from this tissue: differentiation: selective transcription is used by the genomes to differentiate the function of cells. Only the genes needed for that particular cell type are transcribed: induction: ability of one group of cells to influence the fate of nearby cells. Inducers are chemical substances that diffuse from the organizing cell to the responsive cells. Cell specialization: 37 trillion cells that are organized into tissues that are organized into organs within systems. Juxtacrine: a cell is directly stimulating receptors of the adjacent cell.