The plateau phase of the ventricular action potential is caused by - "fast voltage-gated Ca2+ channel opening".
The plateau phase of the ventricular action potential is caused by O fast voltage-gated Ca2+ channels...
3. Many neurons contain "delayed K channels". Like voltage-gated Nat channels, these voltage-gated K+ channels open in response to a rise in membrane potential and then undergo inactivation. However, opening of the voltage-gated K channels lags behind opening of the voltage-gated Na channels. a) Why does neuronal function require the voltage-gated K channels to open more slowly than the voltage-gated Na channels? b) Compared to a neuron that lacks voltage-gated K channels, what differences would you expect in the shape...
Part A The "pacemaker potential of pacemaker cells is produced by the opening of at the end of an action potential. O K+ channels O slow Na+ channels fast Ca2+ channels slow Ca2+ channels Submit Request Answer
CNCORA 6 of 10 > Action potentials in neurons involve opening and closing of voltage-gated Nat and K ion channels. Place the events of an action potential in order, starting and ending with a cell at its resting membrane potential. Resting state Return to resting state Answer Bank A graded potential brings the membrane to threshold potential. Fast Na+ and slow K* channels are activated. Nat rushes into the cell, causing membrane depolarization. K channels close slowly, resulting in hyperpolarization....
choices for A: Na+/K+ pumps, voltage gated K+ channels, voltage gated Ca+ channels, voltage gated Na+ channels choices for B: bidirectionally, unidirectionally choices for C: Na+/K+ pumps, voltage gated K+ channels, voltage gated Ca+ channels, voltage gated Na+ channels choices for D: Na+/K+ pumps, voltage gated K+ channels, voltage gated Ca+ channels, voltage gated Na+ channels Consider this graph illustrating the generation of an action potential across the plasma membrane of a stimulated neuron. +40 ACTION POTENTIAL plasma membrane potential...
The fixed pattern of changes in membrane potential during an action potential is coordinated by the sequential opening and closing of voltage-gated ion channels. Can you identify the status (open/closed) of the voltage-gated Na+ and K+ channels during each phase of an action potential? Drag the appropriate labels onto the graph to indicate the status (open or closed) of the voltage-gated Na+ and K+ channels during each phase of an action potential. Labels may be used once, more than once,...
Dendrotoxins, produced by the mamba snake, are inhibitors of the voltage-gated K+ channels. What phase of the action potential would this toxin affect? How would it affect ion permeability during this phase? How would ion movement be affected?
discuss the steps involved in forming an action potential, starting with the opening of voltage-gated sodium channels
During an action potential, which of the following actions does not help return the membrane to its resting potential? Choose one: O A. the inactivation of voltage-gated Nat channels O B. the opening of voltage-gated K+ channels O C. the opening of voltage-gated Nat channels O D. the flow of K+ through K+ leak channels
Compare the roles that Na+-gated and K+-gated ion channels play in an action potential.
For each phase of an action potential, indicate the ion channel most responsible for the membrane potential change that occurs during the phase. Action Potential Phases Ion Channels Depolarization phase Repolarization phase Hyperpolarization phase Voltage-gated potassium channels Chemically-gated sodium channels Chemically-gated potassium channels Voltage-gated sodium channels