Une: Phsl 1010 Exam 1 Study Guide Questions And Complete Correct Answers

conductance of sodium {Ans: G(k) >> G(Na), AP is triggered by influx of Na into the cell.}integral proteins {Ans: Penetrate the hydrophobic interior of the lipid bilayer. Commerce via facilitated or active.}electrical synaptic transmission {Ans: neurons are connected via gap junctions, passive spread of depolarization, transmission of signal is immediate}facilitated diffusion {Ans: Movement of specific molecules across cell membranes through protein channels. Passive transport down the electrochemical gradient.}How would capacitance be measured across a membrane? {Ans: Can use recording electrode inside the cell (-70mV) and reference electrode in the saline bath (0 mV).}Neurons {Ans: excitable tissue; generates and conducts electrical signals}muscarinic receptors {Ans: Cholinergic receptors that are located postsynaptically in the effector organs such as smooth muscle, cardiac muscle, and glands supplied by parasympathetic fibers. Are normally activated by acetylcholine.}Neurotransmitters {Ans: chemical messengers that cross the synaptic gaps between neurons}neurotransmitter release {Ans: - prior to release, neurotransmitter molecules are stored in membrane-bound vesicles in nerve terminal -when AP reaches nerve terminal, voltage gated calcium channels open allowing calcium to flow into cell -sudden increase in Ca triggers fusion of vesicles w/ the membrane at the synapse causing exocytosis of the neurotransmitter