Question

An Action Potential is accompanied by: (1) Cell's interior becoming positive (22) Cell's interior becoming negative (3) Change from gray matter to white matter (4) Change from white matter to gray matter

• A. Cell’s interior becoming positive
• B. Cell’s interior becoming negative
• C. Change from gray matter to white matter
• D. Change from white matter to gray matter

Hint:

The cell interior becomes positive.

Answer 1

The Correct Option is A

During an action potential (the "firing" of a neuron), there is a rapid influx of sodium ions (Na+), causing the inside of the cell membrane to become temporarily positive relative to the outside. This process is known as depolarization.

• Key event: Sodium ions enter the neuron, reversing the membrane potential.
• Result: The inside of the cell becomes positive compared to the outside.
• Significance: Depolarization is essential for transmitting electrical signals along the neuron.