Potassium channels are mainly responsible for what?

• A. Mediating action potentials
• B. Returning the neuron to a resting membrane potential
• C. Releasing neurotransmitters
• D. Depolarization

Answer: (B)

Verified step by step guidance

1. Understand the role of potassium channels in neurons. Potassium channels are integral membrane proteins that allow potassium ions (K+) to pass through the cell membrane.
2. Recognize that during an action potential, the neuron's membrane potential changes due to the movement of ions across the membrane.
3. Identify that after an action potential, the neuron needs to return to its resting membrane potential, which is typically around -70 mV.
4. Know that potassium channels open to allow K+ ions to flow out of the neuron, which helps to repolarize the membrane and return it to the resting potential.
5. Conclude that the primary role of potassium channels in this context is to return the neuron to its resting membrane potential after depolarization has occurred.