GMS6552: ION CHANNELS I EXAM QUESTIONS AND ANSWERS WITH COMPLETE SOLUTIONS VERIFIED

GMS6552: ION CHANNELS I EXAM QUESTIONS AND ANSWERS WITH COMPLETE SOLUTIONS VERIFIED neurotransmission the process of transferring information from one neuron to another at a synapse otto lowei - chemical nature of nerve transmission - proved that some soluble chemical released by the vagus nerve was controlling the heart rate -found it was acetylcholine water is a __________ solvent. -dipole T/F: In a cell, sodium is found in HIGHER concentrations OUTSIDE and potassium is found in HIGHER concentrations INSIDE. True ion channels -use a concentration gradient -creates a current T/F: for every 3 sodium ions out, 2 potassium ions in True how do we measure the electrical energy of a cell? -electrode placed -resting potential measured why is there a resting potential? -at rest, cell membranes are selectively permeable to potassium ions and relatively impermeable to sodium ions zF x Em = RT ln [ion] out/[ion] in z= valence of electron F= number of coulombs in a mole Em = electrical energy (voltage) T/F: the cell's membrane functions as a capacitor, the cell's electrical potential is the charge on that capacitor True ohms law for a cell -based on ion channels as conductors of electricity gating -A property of many ion channels, making them open or closed in response to specific signals, such as membrane voltage or the presence of neurotransmitters -voltage-gated -ligand-gated factors affecting opening probability for voltage-gated ion channels -membrane voltage