BIOL 225 Lecture Notes - Lecture 7: Extracellular Fluid, Endocrine System, Autocrine Signalling
11 Mar 2018
School
Department
Course
Professor
Document Summary
Chemical signal: a molecule released by on cell that may influence the activity of another cell. Involved in endocrine signaling: secrete hormones directly into the circulatory system to be carried towards distant target organs: different types: steroid, polypeptide, or amine, can be polar or non polar. In general: polypeptides and proteins= water-soluble, steroids: lipid-soluble. Receptor protein: required for a cell to respond to a chemical signal, very specific chemical lock and key" arrangement, can be found in, plasma membrane. Intracellular: different cells may respond differently to the same chemical signal: Depends as much on the cell receiving the signal as the signal itself. Pheromone: the molecule is released by the organism; the cell influenced is another organism. Signal transduction: the linkage of a mechanical, chemical or electromagnetic stimulus to a specific nuclear response. = cascade of reactions: cascade reaction helps amplify the signal before causing an ultimate response, ex: 1 molecule of epinephrine can trigger the release of about.
