Chapter 12 Review Cont question n answers graded A+ 2023

Chapter 12 Review Cont What is Electrophysiology? - correct answer Cellular mechanisms for producing electrical potentials and currents. What is Electrical potential? - correct answer A difference in concentration of charged particles between one point and another. What is Electrical current? - correct answer A flow of charged particles from one point to another? In the body, what are "currents"? - correct answer Movements of ions, Na+ or K+, through gated channels in the plasma membrane. What "opens" or "closes" gated channels? - correct answer Various stimuli. At rest, are living muscles and nerve cells polarized or unpolarized? - correct answer Polarized. What is the "Resting Membrane Potential (RMP)? - correct answer Charge difference across plasma membrane. Are more negatively charged particles on the inside of the membrane or the outside of the membrane? - correct answer The inside of the membrane. (ICF). What creates RMP? - correct answer Ions diffuse down their concentration gradient through membrane; Plasma membrane is selectively permeable and allows some ions to pass easier than others; electrical attraction of cations and anion to each other. What ion has the greatest influence on RMP? - correct answer Potassium ions (K+).