The permeability of which of the following ion leads to resting membrane potential?
Correct Answer: Potassium
Description: Ionic Basis of Nerve Resting Membrane Potential
• RMP: Resting membrane potential is a potential difference across the cell membrane in millivolts, which is by convention -70 Mv.
• RMP is established by the diffusion potential that results from concentration differences of permeable ions.
• Resting membrane potential (-70 mV) is close to equilibrium potential of K+ and Cl (both-85 mV) and far from the equilibrium potential of Na+ (+65 mV). That means at rest the nerve membrane is more permeable to K+ than Na+
• Na+ is actively transported out of neurons and other cells and K+ is actively transported into cells, but because K+ permeability at rest is greater than Na+ permeability, K+ channels maintain the resting membrane potential.
Category:
Physiology
Get More
Subject Mock Tests
Practice with over 200,000 questions from various medical subjects and improve your knowledge.
Attempt a mock test nowMock Exam
Take an exam with 100 random questions selected from all subjects to test your knowledge.
Coming SoonGet More
Subject Mock Tests
Try practicing mock tests with over 200,000 questions from various medical subjects.
Attempt a mock test now