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Which of the following increases when an...

Which of the following increases when an action potential is initiated ?

A

Diffusion of `Na^(+)` ions into the neuron

B

Diffusion of `Na^(+)` ions out of the neuron

C

Diffusion of `K^(+)` ions into the neuron

D

Diffusion of `K^(+)` ions out of the neuron

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question "Which of the following increases when an action potential is initiated?", we can follow these steps: ### Step-by-Step Solution: 1. **Understanding Action Potential**: - An action potential is a rapid change in the membrane potential of a neuron, which occurs when a stimulus causes the neuron to become depolarized. 2. **Resting State of Neuron**: - In the resting state, the neuronal membrane is polarized. The inside of the neuron is negatively charged compared to the outside, primarily due to the higher concentration of potassium ions (K+) inside and sodium ions (Na+) outside. 3. **Initiation of Action Potential**: - When a stimulus is applied, the membrane becomes permeable to sodium ions (Na+). This permeability change allows sodium ions to diffuse into the neuron. 4. **Diffusion of Sodium Ions**: - As sodium ions diffuse into the neuron, the positive charge from the sodium ions causes the inside of the neuron to become more positive, leading to depolarization. 5. **Conclusion**: - Therefore, the correct answer to the question is that the **diffusion of sodium into the neuron increases** when an action potential is initiated. ### Final Answer: The correct option is: **Diffusion of sodium into the neuron.** ---
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