Before an action potential begins,the fluid outside an axon's membrane has ________ ions;the fluid inside has ________ ions.
A) mostly negatively charged;mostly positively charged
B) equal numbers of positively and negatively charged;equal numbers of positively and negatively charged
C) mostly positively charged;mostly negatively charged
D) neither positively nor negatively charged;neither positively nor negatively charged

Question

Quizplus · Accepted Answer

The fluid outside of an axon's membrane has a higher concentration of positively charged ions, such as sodium ions (Na+), while the fluid inside has a higher concentration of negatively charged ions, such as potassium ions (K+) and protein ions (A-). This difference in ion concentration is known as the resting potential and is necessary for the initiation of an action potential.

Before an Action Potential Begins,the Fluid Outside an Axon's Membrane