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Unformatted text preview: various signals. * ion concentration across the channel * electrical impulses * neurotransmitters and hormones Nervous System Neural Impulses Membrane Potentials * in a resting membrane their is a difference in the electrical charge between the inside and outside of the neuron. * the outside is positive and the inside is negative * this occurs because of the differences in the relative concentrations of K+ and negatively charged proteins in side the cell and the Na+ outside the cell. * the resting charge of a cell at rest is -70 millivolts * A cell that has a resting membrane potential is said to be polarized Neural Impulses * Sodium/Potassium pump- maintains the K+ and Na+ concentrations (thus charge difference or resting membrane potential ) across the plasma membrane ( Polarized )....
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- Fall '10