Definition: A portion of a line which starts at a point and goes off in a particular direction to infinity. Try this Adjust the ray below by dragging an orange dot and see how the ray AB behaves. Point A is the ray's endpoint.
Plant cell cross-section, showing the membrane. Animal cell cross-section, showing the membrane. Resting membrane potential is the difference in voltage of the fluids inside a cell and outside a cell, which is usually between -70 to -80 millivolts (mV). View slideshow of images above.
I know the resting membrane potential is the voltage difference across a cell membrane or the electrical potential energy of the ions inside/outside the cell. I also know that at the resting state, there is a higher concentration of K inside, and Na outside.