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m_a_m_a [10]
3 years ago
7

The fixed pattern of changes in membrane potential during an action potential is coordinated by the sequential opening and closi

ng 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?
Biology
1 answer:
baherus [9]3 years ago
7 0
<h2>Na-K channels</h2>

Explanation:

  • Brief sequential change in the membrane potential of excitable cells after stimulus is called action potential whereas membrane potential represent charge difference across the membrane
  • In a typical neuron cell, membrane potential of cytoplasm is negative at rest and hence called resting membrane potential
  • Resting membrane potential of excitable cells is established by Na+ K+ pump and maintained by K+ leaky channels at rest
  • Phases of action potential includes: depolarization, repolarization, hyperpolarization and resting membrane potential
  • Depolarization starts when a threshold stimulus is applied on a neuron when via Na+ mechanically operated channels that trigger action potential
  • Depolarization of membrane potential is due to influx of Na+ via voltage gated Na+ channels
  • Repolarization starts with the efflux of K+ by the opening of voltage gated K+ channels, voltage gated K+ channels starts to open when voltage gated Na+ channels becomes inactive
  • Hyperpolarization occurs due to excessive efflux of K+ by voltage gated K+ channels
  • Additional efflux of K+ occurs due to slow inactivation of voltage gated K+ channel  
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<h2>Availability of Plankton</h2>

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