ch.7 part 2.docx - Resting Membrane Potential Neurons have...

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Resting Membrane Potential Neurons have a resting membrane potential of -70 mV. o Established by a large negative molecules inside the cell o Na+/K+ pumps o Permeability of the membrane to positively charged, inorganic ions Altering Membrane Potential Neurons and muscle cells can change their membrane potentials. Called excitability or irritability Caused by changes in the permeability to certain ions. Caused by changes in the permeability to certain ions Ions will follow their electrochemical gradient= combination of concentration gradient and attraction to opposite charges Flow of ions are called ion currents which occur in limited areas where ion channels are located. ( the stronger the stimulation the more sodium channels will open) ( at +35 na channels close and k channels open) Changes in membrane potential; At rest a neuron is considered polarized when the inside is more negative than the

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