Once Threshold Potential Has Been Achieved, the Permeability of the Membrane

Question

Once threshold potential has been achieved, the permeability of the membrane to Na⁺ is A) greater than it was at rest. B) greater than its permeability to K⁺. C) increased due to activation of voltage-gated Na⁺ channels. D) all of these. E) none of these.

Accepted Answer

Once threshold potential is reached, the permeability of the membrane to sodium (Na+) increases significantly. This is because voltage-gated sodium channels open, making the membrane more permeable to Na+ than at rest and more permeable to Na+ than to potassium (K+), which aligns with all the statements provided.

Once threshold potential has been achieved, the permeability of the membrane to Na+ is

Once threshold potential has been achieved, the permeability of the membrane to Na⁺ is