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What is the difference between membrane potential and resting potential?

For a cell’s membrane potential, the reference point is the outside of the cell. Because there is a potential difference across the cell membrane, the membrane is said to be polarized. If the membrane potential becomes more positive than it is at the resting potential, the membrane is said to be depolarized.

What factors affect resting membrane potential?

The resting membrane potential is determined mainly by two factors:

  • the differences in ion concentration of the intracellular and extracellular fluids and.
  • the relative permeabilities of the plasma membrane to different ion species.

What causes the inside of the membrane to reverse charge and begin the action potential?

What causes the inside of the membrane to reverse charge and begin the action potential. A stimulus will depolarize and the potassium channel will close so sodium rushes in and makes it more positive. Potassium channel opens, Sodium channel closes and potassium ions rush inside.

How does temperature affect membrane potential?

As the temperature is increased, the amplitude of action potential is decreased and its duration is reduced. Cooling reduces the resting potential (depolarization) and this leads to a rise in action potential frequencies; but certain nerve cells show a frequency increase when temperature is raised.

How does temperature affect cell potential?

Depending on how you write the Nernst equation the temperature might increase or decrease the potential of the cell. The temperature comes in to the equation as a scaling factor where RT/nF has units Volt. This essentially defines how much the voltage changes per a decade change in the reaction quotient.

What trends in the action potential do you notice as the temperature begins to decrease? 22 degrees C; as the temperature begins to decrease, the action potential takes longer to depolarize and the entire action potential takes longer as well.

What causes the falling phase of the action potential select the best answer?

What causes the falling phase of the action potential? Select the best answer. Voltage-gated sodium channels inactivate soon after opening, halting Na+ inflow, and most voltage-gated potassium channels open, causing a rapid outflow of K+. Both events combine to cause the falling phase of the action potential.

What is responsible for the repolarization phase of an action potential in a nerve?

Repolarization is a stage of an action potential in which the cell experiences a decrease of voltage due to the efflux of potassium (K+) ions along its electrochemical gradient. This phase occurs after the cell reaches its highest voltage from depolarization.