Nerve Impulse
During the resting state of a neural membrane, diffusion due to concentration gradients, if allowed, would drive:
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About This Question
- Subject
- biology
- Chapter
- neural control and coordination
- Topic
- nerve impulse
- Difficulty
- Medium
- Year
- 2025
Solution
Correct Answer:
Na+ into the cell
- Definition: The resting state occurs when a neuron is not conducting an impulse. The membrane is polarized.
- Concentration Gradients: The concentration of Na+ is significantly higher outside the cell, while K+ is higher inside.
- Permeability: Although the membrane is mostly impermeable to Na+ at rest, any allowed diffusion would follow the concentration gradient.
- Conclusion: Therefore, Na+ would diffuse INTO the cell from the area of high concentration to low concentration.
This medium difficulty biology question is from the chapter neural control and coordination, covering the topic of nerve impulse. It appeared in the 2025 exam.
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