Nerve Neurophysiology Lab.docx

Nerve Neurophysiology Lab.docx - Neurophysiology of Nerve...

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Neurophysiology of Nerve Impulses Biology 361.002 Activity 1: 1.) Potassium ions diffuse out across the membrane. 2.) If the extracellular K is increased, the intracellular K will decrease and the membrane potential will become less negative. I predicted this change would occur. 3.) A change did not alter the membrane because it wasn’t fully charged. 4.) Membrane permeability to sodium is very low because there are only few sodium leakage channels. 5.) The resting period potential is a potential difference between the inside of the cell and the outside of the cell across the membrane therefore it depends. Activity 2: 1.) A sodium ion channel. 2.) Graded potentials are incoming signals which are short-lived localized changes in the membrane. They can either be depolarizations or hyperpolarizations. 3.) Pressure high, 40 MV; even though my prediction was right, I still second guessed myself. 4.) Chemical High, 25 MV; my prediction was completely wrong. 5.) Photoreceptors would respond to the green light. Activity 3: 1.) Threshold is the minimal stimulus needed to generate an action potential. 2.) Depolarization triggers an action potential 3.) The action potential didn’t change, as the stimulus voltage increased, the peak at R1 and R2 stayed at 100.
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  • Fall '08
  • keen

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