What is the typical resting potential of a neuron?

What is the typical resting potential of a neuron?

• A. +30 mV
• B. -60 mV
• C. -70 mV
• D. -90 mV

Answer: (C)

The typical resting potential of a neuron is approximately -70 mV. This potential is primarily established by the distribution of ions across the neuronal membrane, particularly sodium (Na+) and potassium (K+) ions. At rest, the neuron is more permeable to K+ ions, which diffuse out of the cell, making the inside more negative relative to the outside. The sodium-potassium pump also plays a crucial role by actively transporting Na+ out of the cell and K+ into the cell, further contributing to this negative internal environment. This resting potential is essential for the generation of action potentials, allowing neurons to respond to stimuli. An understanding of resting potential is fundamental in cell signaling because it forms the baseline from which depolarization and hyperpolarization occur during action potentials, affecting how signals are transmitted within the nervous system.

The typical resting potential of a neuron is approximately -70 mV. This potential is primarily established by the distribution of ions across the neuronal membrane, particularly sodium (Na+) and potassium (K+) ions. At rest, the neuron is more permeable to K+ ions, which diffuse out of the cell, making the inside more negative relative to the outside. The sodium-potassium pump also plays a crucial role by actively transporting Na+ out of the cell and K+ into the cell, further contributing to this negative internal environment.

This resting potential is essential for the generation of action potentials, allowing neurons to respond to stimuli. An understanding of resting potential is fundamental in cell signaling because it forms the baseline from which depolarization and hyperpolarization occur during action potentials, affecting how signals are transmitted within the nervous system.