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Section 1: Cells are Batteries
Cells are Batteries. They generate an electrical potential (voltage) across the cell membrane. For most cells, this is analogous to the DC current generated by a battery.
The video above shows how the voltage across the membrane of a cell can be measured, using a fish egg as a substitue for a cell. There is a separation of charge across the membrane of the cell, and when the circuit is completed (by putting the whole setup into water, for example), a voltage can be measured as a deflection on the oscilloscope.
So that's what we mean when we say cells are batteries: they can produce a measurable electrical voltage.
We call this voltage the membrane potential.
In the second section of this chapter, we explore the origin of the cell membrane potential.
Section 1: Cells are Batteries
Section 2: Why Are Cells Batteries?
Section 4: The Neuron Action Potential
Section 5: Muscle Fiber Action Potential
Section 6: Synapses and the Neuromuscular Junction (NMJ)
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