[Campbell Biology P.1121] According to the text, what is the primary cause of hyperpolarizati... | Practice Question

According to the text, what is the primary cause of hyperpolarization in a resting neuron?

  • A: Increased inflow of Na+ ions.
  • B: Increased outflow of K+ ions.
  • C: Decreased permeability to Cl- ions.
  • D: Activation of the Na+/K+ pump.

Explanation

The text states that if gated potassium channels in a resting neuron open, the membrane's permeability to K+ increases. As a result, net diffusion of K+ out of the neuron increases, shifting the membrane potential toward EK -90 mV and causing hyperpolarization.