Which type of channels are crucial for maintaining the resting membrane potential in neurons?

Which type of channels are crucial for maintaining the resting membrane potential in neurons?

• A. Fast Na channels
• B. Leaky K channels
• C. Ca channels
• D. All of the above

Answer: (B)

Leaky potassium channels, also known as background or resting potassium channels, play a vital role in maintaining the resting membrane potential in neurons. These channels remain open even when the neuron is not firing action potentials, allowing potassium ions to move more freely across the membrane. Since there is a higher concentration of potassium ions inside the cell compared to the outside, this efflux of potassium leads to a negative charge inside relative to the outside, thus establishing the resting membrane potential. In contrast, fast sodium channels are primarily involved in generating action potentials by allowing sodium ions to flow into the cell rapidly, which depolarizes the membrane when the neuron is activated. Calcium channels facilitate various cellular processes, including neurotransmitter release, but they do not contribute significantly to maintaining the resting potential under normal circumstances. While all these channels are important in different phases of neuronal activity, leaky potassium channels are specifically critical for setting and stabilizing the resting membrane potential.

Leaky potassium channels, also known as background or resting potassium channels, play a vital role in maintaining the resting membrane potential in neurons. These channels remain open even when the neuron is not firing action potentials, allowing potassium ions to move more freely across the membrane. Since there is a higher concentration of potassium ions inside the cell compared to the outside, this efflux of potassium leads to a negative charge inside relative to the outside, thus establishing the resting membrane potential.

In contrast, fast sodium channels are primarily involved in generating action potentials by allowing sodium ions to flow into the cell rapidly, which depolarizes the membrane when the neuron is activated. Calcium channels facilitate various cellular processes, including neurotransmitter release, but they do not contribute significantly to maintaining the resting potential under normal circumstances. While all these channels are important in different phases of neuronal activity, leaky potassium channels are specifically critical for setting and stabilizing the resting membrane potential.