In a resting potential, an example of a cation that is more abundant as a solute in the cytosol of a neuron than it is in the interstitial fluid outside the neuron is ________.
A) Cl⁻
B) Ca⁺⁺
C) Na⁺
D) K⁺

Question

Quizplus · Accepted Answer

The cation that is more abundant in the cytosol of a neuron compared to the interstitial fluid is K⁺. This is because K⁺ channels in the cell membrane allow K⁺ to move out of the cell, leading to a higher concentration of K⁺ in the cytosol. This gradient is important for maintaining the resting potential of -70 mV in neurons. Other options like Na⁺, Ca⁺⁺, and Cl⁻ are typically more abundant in the interstitial fluid compared to the cytosol of a neuron.

In a Resting Potential, an Example of a Cation That