What occurs when the threshold potential of a neuron is reached?

What occurs when the threshold potential of a neuron is reached?

• A. Na+ channels close
• B. K+ ions diffuse inward
• C. Na+ channels open and Na+ diffuses in
• D. The neuron becomes hyperpolarized

Answer: (C)

When the threshold potential of a neuron is reached, sodium channels open, allowing sodium ions (Na+) to diffuse into the neuron. This influx of Na+ causes the interior of the neuron to become more positive relative to the outside, leading to depolarization. This rapid change in membrane potential is a critical step in the generation of an action potential, which is essential for the transmission of nerve impulses. The opening of sodium channels and the subsequent influx of Na+ serve to amplify the signal, allowing the neuron to reach a point where it can initiate an action potential and propagate a signal along the axon. This depolarization is a fundamental process in neuronal communication, highlighting the importance of the threshold potential in the functioning of neurons.

When the threshold potential of a neuron is reached, sodium channels open, allowing sodium ions (Na+) to diffuse into the neuron. This influx of Na+ causes the interior of the neuron to become more positive relative to the outside, leading to depolarization. This rapid change in membrane potential is a critical step in the generation of an action potential, which is essential for the transmission of nerve impulses.

The opening of sodium channels and the subsequent influx of Na+ serve to amplify the signal, allowing the neuron to reach a point where it can initiate an action potential and propagate a signal along the axon. This depolarization is a fundamental process in neuronal communication, highlighting the importance of the threshold potential in the functioning of neurons.