Asked Sep 14, 2019

What is the process of an action potential in muscle tissue? 


Expert Answer

Step 1

The question asks about the process involved in an action potential of muscle tissue.

Step 2

An action potential can be defined as a swift rise and succeeding fall in the membrane potential or the voltage through a cellular membrane with a distinctive pattern. In neurons, an action potential has a significant function in cell-to-cell communication.

The action potential in muscle lasts roughly about 2–4 milliseconds. In the muscle cells, an action potential is the first step of the series of events that leads to the contraction. In a normal muscle cell, an action potential is similar as it takes place in neurons.

Step 3

Steps involved in the process of an action potential of muscle tissue are:

  1.    The stimulus for threshold voltage:

The stimulus for the production of an action potential is required. It should be above the threshold voltage. In this stimulation, the sensory receptor cell partially opens the voltage-sensitive molecules channel in the cell membrane.

  1. Depolarization:

     Depolarization occurs by a rapid increase in membrane potential. It opens the sodium channels in the cell membrane and results in a huge influx of sodium ions.

  1. Repolarization:

Due to the accumulation of sodium ions inside the cell there occurs the repolarization of the membrane. It results from the rapid inactivation of the sodium channel and the potassium ion channels become activated. There would be a large efflux of potassium ions due to the activation of the potassium channels.

  1. Hyperpolarization:

When there is an accumulation of potassium ion outside the cell, potassium channels become close. There takes place hyper polarization due to the closing of the potassium channels and a lowered membr...

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