Which event occurs during neuronal depolarization? a. membrane potential returns to normal b. cations leave the cytosol c. membrane potential remains stable d. membrane potential decreases e. plasma membrane becomes less permeable

During neuronal depolarization, the event that occurs is d. membrane potential decreases.

Here's a step-by-step explanation:

1. Neuronal depolarization is a part of the process that occurs when a neuron sends a signal down its axon (the long, tail-like part of the neuron that leads away from the cell body).

2. Normally, neurons have a resting membrane potential, which is a balance of positive and negative charges across their membrane. This is typically around -70 millivolts (mV).

3. When a neuron is stimulated, ion channels in its membrane open up. This allows positively charged ions (cations) to flow into the neuron.

4. This influx of positive charges makes the inside of the neuron less negative compared to the outside. In other words, the membrane potential decreases. This is what we call depolarization.

5. If the depolarization reaches a certain threshold, it triggers an action potential. This is the electrical signal that travels down the neuron's axon.

6. After the action potential, the neuron repolarizes to restore the resting membrane potential. This is done by pumping the cations back out of the neuron.

So, the correct answer to your question is d. membrane potential decreases.

During neuronal depolarization, the event that occurs is d. membrane potential decreases.

Here's a step-by-step explanation:

1. Neuronal depolarization is a part of the process that occurs when a neuron sends a signal down its axon (the long, tail-like part of the neuron that connects to other neurons).

2. Normally, the inside of a neuron is negatively charged compared to the outside. This is due to a higher concentration of positively charged ions outside the neuron and a higher concentration of negatively charged ions inside. This difference in charge creates what's known as a membrane potential.

3. When a neuron is stimulated, channels in its membrane open to allow positively charged ions to flow in. This influx of positive ions decreases the difference in charge between the inside and outside of the neuron, causing the membrane potential to decrease. This is known as depolarization.

4. So, during neuronal depolarization, the membrane potential decreases (option d).