Biology
5th Edition
ISBN: 9781260487947
Author: BROOKER
Publisher: MCG
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Chapter 42.3, Problem 1CC
Summary Introduction
To determine: The way in which action potential can be affected if Na+ channels did not have their inactivation gates.
Introduction: Action potential comprises electrical events that facilitate the transport of the signal across the membranes. At threshold, the potential of the membrane is -55 to -50 mV. On receiving the stimuli voltage gated Na+ channel open and initiate an action potential.
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What happens if a potassium channel opened before sodium channels during the action potential process?
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what would happen to the action potential if the potassium channels opened before the sodium channels?
Chapter 42 Solutions
Biology
Ch. 42.1 - Prob. 1CCCh. 42.2 - Prob. 1CSCh. 42.3 - Prob. 1CSCh. 42.3 - Prob. 2CSCh. 42.3 - Prob. 1CCCh. 42.3 - Prob. 2CCCh. 42.4 - What key prior observation led Loewi to develop...Ch. 42.4 - CoreSKILL The results of Loewis experiment...Ch. 42.4 - Prob. 3EQCh. 42 - Prob. 1TY
Ch. 42 - Prob. 2TYCh. 42 - The myelin sheath a. is produced by neurons in the...Ch. 42 - Prob. 4TYCh. 42 - Prob. 5TYCh. 42 - Which of the following contribute(s) to the...Ch. 42 - Prob. 7TYCh. 42 - Prob. 8TYCh. 42 - Prob. 9TYCh. 42 - Prob. 10TYCh. 42 - Prob. 1CQCh. 42 - Prob. 2CQCh. 42 - Prob. 3CQCh. 42 - Describe the difference between an electrical...Ch. 42 - Prob. 2COQ
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- Define an action potential.arrow_forwardFigure 35.11 Potassium channel blockers, such as amiodarone and procainamide, which are used to treat abnormal electrical activity in the heart, called cardiac dysrhythmia, impede the movement of K+ through voltage-gated K+ channels. Which part of the action potential would you expect potassium channels to affect?arrow_forwardWhen action potentials arrive at a synapse between a neuron and another cell, they stimulate the release of molecules of a ________ that diffuse over to that cell.arrow_forward
- Action potentials occur when ______. a. potassium gates close b. a stimulus pushes membrane potential to threshold c. sodium-potassium pumps become active d. neurotransmitter is reabsorbedarrow_forwardDraw and label an action potential, indicating the ion movements responsible for the rising phase and the falling phase.arrow_forwardConformational changes in channel proteins brought about by voltage changes are responsible for opening and closing Na+ and K+ gates during the generation of an action potential. (True or false?)arrow_forward
- How can only positive ions result in depolarization and repolarization of the membrane during an action potential?arrow_forwardthe potassium leak channels were suddenly blocked in a resting neuron, what would happen to its resting membrane potential?arrow_forwardIndicate which gate is responsible for halting the rising phase of the action potential. 1- Na+ inactivation gate opens 2- Sodium activation gate closes 3-Na+ inactivation gate closes 4- K+ gate closes 5-Na+ activation gate opensarrow_forward
- Why does neuronal function require the voltage-gated K+ channels to open moreslowly than the voltage-gated Na+ channels and how would you expect the voltage-gated K+ channels to affect the shape of an action potential curve?arrow_forwardHow much of a change in the membrane potential is necessary for the summation of postsynaptic potentials to result in an action potential being generated?arrow_forwardWhy there is a refractory period in the action potential?arrow_forward
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