Anatomy & Physiology
1st Edition
ISBN: 9781938168130
Author: Kelly A. Young, James A. Wise, Peter DeSaix, Dean H. Kruse, Brandon Poe, Eddie Johnson, Jody E. Johnson, Oksana Korol, J. Gordon Betts, Mark Womble
Publisher: OpenStax College
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Textbook Question
Chapter 12, Problem 27RQ
Which of the following voltages would most likely be measured during the relative refractory period?
- +30 mV
- 0 mV
- -45 mV
- -80 mv
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Which of the following voltages would most likely bemeasured during the relative refractory period?a. +30 mVb. 0 mVc. -45 mVd. -80 mv
which of the following would be true (more than one can be true)?
a) summation of A and X would reach threshold b) summation of C and A would be a graded potential
c) stimulation by A would depolarize cell d) stimulation by B would be a subthreshold depolarization
e) summation of B and C would be a graded potential with the net value of 12 mV depolarization
What guarantees that there are unidirectional action potentials?
Choice
A threshold
B. Depolarization refractory period
C. Absolute refractory period
Relative refractory period
Chapter 12 Solutions
Anatomy & Physiology
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- Conformational 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_forwardDraw and label an action potential, indicating the ion movements responsible for the rising phase and the falling phase.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_forward
- Define an action potential.arrow_forwardIn the resting state, before or long after an action potential occurs, the activation gates of voltage regulated sodium channels are _____, the inactivation gates of the voltage regulated sodium channels are _____, and the voltage regulated potassium channels are _____arrow_forwardShow a complete circuit diagram of the model of the neuron using the specific numerical values for each component: potassium ion concentration outside: 4.0 mmol/L potassium ion concentration inside: 77.5 mmol/Larrow_forward
- The level of depolarization at which an action potential will be triggered is referred to as the Multiple Choice a) cationic potential. b) membrane potential. c) threshold potential. d) refractory potential. e) resting potential.arrow_forwardDuring the _____ phase of an action potential, both gates of the voltage regulated sodium channels are open and the voltage regulated potassium channels are closed.arrow_forwardPropagation of action potential and transmission mean: current flow along the cell membrane current flow through the synapse current flow using saltatory conduction all of the abovearrow_forward
- Which of these ions is actively transported through the cell membrane to re-establish a resting potential? K and Mg Na and K Mg and Cl Ca and Clarrow_forwardGraph an action potential, showing the change inelectrical potential on the y-axis and time on the x-axis.Indicate on the graph the phases when voltage-gated Na1 andK1 ion channels are opened and when they are closedarrow_forwardWhich of the following combinations of spatial summation of postsynaptic potentials (PSP) would result in an action potential in a typical neuron? The voltage given for each PSP is measured as it reaches the axon hillock. Axon A EPSP 25 mV & axon B IPSP 10 mV Axon A IPSP 25 mV & axon B EPSP 10 mV Axon A IPSP 5 mV & axon B IPSP 5 mV Axon A EPSP 5 mV & axon B EPSP 5 mVarrow_forward
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