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Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN: 9780134580999
Author: Elaine N. Marieb, Katja N. Hoehn
Publisher: PEARSON
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List the series of events at the membrane that generate an action potential, including the contributions of chemically gated and voltage-gated ion channels?
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- Describe in detail the three types of potentials seen in neurons and functions of three types of potentials.arrow_forwarddescribe what the resting membrane potential of a cell is. What is the resting membrane potential of neurons (give units)? What are the two factors that generate the resting membrane potential? Think of scenarios that change the factors that generate the resting membrane potential and how that would change the overall resting membrane potential.arrow_forwardExplain the forces that produce the resting membrane potential?arrow_forward
- Please answer both 1) What is responsible for returning the cell to its normal resting membrane potential following the absolute refractory period? a) K+ leak channels b) the Na+/K+ pump c) activation of voltage-gated Na+ channels d) a ligand binding to a ligand-gated Na+ channel 2) What property of an action potential allows it to propagate? a) the rapid period of depolarization b) the rapid period of repolarization c) the brief period of hyperpolarization d) the fact that the peak is 85 mV above thresholdarrow_forwardWhat is the membrane threshold and describe its role with grade potential's in action potential'sarrow_forwardDescribe how an action potential is generated in a neuron. Include channels that are open/closed during this process and be sure to include terms such as depolarization, threshold, hyperpolarization, and repolarization.arrow_forward
- Describe the role of sodium ions and sodium channels in generating an action potentialarrow_forwardDraw a presynaptic and postsynaptic neuron at to demonstrate the release and acceptance of a neurotransmitter. Identify the following in your drawing: Ca2+, synaptic cleft, receptor, synaptic vessicle, SNARE, presynaptic neuron, postsynaptic neuronarrow_forwardDescribe the events of an action potential in terms of ions and gates or channels beginning with the generation of a local potential through the re-establishment of resting membrane potential.arrow_forward
- If: membrane potential=-70mV, ENa=+60mV, and Ex=-90mV, consider which directions Na+ and K+ will leak across the membrane. If both ions are crossing the membrane, what is the most important factor in determining whether membrane potential will become more positive or more negative?arrow_forwardWhat kinds of changes in ion conductance may be expected in an action potential? And how do ion channels permit these changes?arrow_forwardWhat is the difference between a ligand-gated channel (like H1 or the AChR) and a voltage gated channel?arrow_forward
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