Resting membrane potential

The video tutorial by Doctor Morton explains the concept of resting membrane potential, its significance, and how it is measured. It covers the role of ion channels, particularly potassium and sodium, in establishing and maintaining this potential. The tutorial also delves into the Nernst equation for calculating equilibrium potential and discusses the sodium-potassium pump's role in maintaining the resting membrane potential. The importance of understanding these concepts for medical students is emphasized throughout.

What is the resting membrane potential primarily responsible for in cells?

• Electrical signaling

• Transport of nutrients

• Protein synthesis

• Cell division

How is the resting membrane potential measured?

• With a voltmeter and electrodes

• Through chemical reactions

• Using a thermometer

• By observing cell color changes

What happens to the resting membrane potential when sodium channels open?

• It becomes less negative

• It becomes more negative

• It becomes zero

• It remains unchanged

What is the role of potassium leak channels in resting membrane potential?

• They allow potassium to move in and out

• They prevent ion movement

• They increase cell temperature

• They block sodium ions

What is the equilibrium potential for potassium?

• -88 millivolts

• 0 millivolts

• -40 millivolts

• +88 millivolts

Which equation is used to calculate the resting membrane potential?

• Boyle's Law

• Nernst Equation

• Newton's Law

• Pythagorean Theorem

What is the resting membrane potential for a typical neuron?

• -40 millivolts

• -60 millivolts

• -90 millivolts

• -84 millivolts

How does the sodium-potassium pump contribute to resting membrane potential?

• By pumping potassium out of the cell

• By maintaining ion gradients

• By pumping sodium into the cell

• By increasing cell size

What percentage of ion movement across the membrane at rest is potassium?

• 1%

• 10%

• 90%

• 50%

Which ion is most important in establishing the resting membrane potential?

• Sodium

• Chloride

• Calcium

• Potassium