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AP_Bio_-_nerve_cell_signalling - :NerveCells GuidedNotes I...

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AP Bio - Specialized Cell Communication: Nerve Cells Guided Notes I. Review Membrane Potential a. Key ions: Na+ , K+ , Cl- , organic anions , Ca 2+ b. Resting membrane potential is about -70 mV  (neg inside, pos out) c. d. What can change the membrane potential? e. Animated tutorial #1 (www.thelifewire.com) II. Neuron Structure:  Dendtrites, cell body, axon hillock, axon, Schwann cell,  Node of Ranvier III. Changes in Membrane Potential a.  Graded Potentials (changes that can “build upon” one another) i. Hyperpolarization: 1. K+ channels open, K+ moves out;  reduces the internal  charge even more 2. This can inhibit an action potential ii. Depolarization:
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1. Na+ channels open, Na+ moves into cell;  brings  membrane potential closer to zero 2. This makes an action potential more likely 3. there is a threshold potential  which can cause an action 
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AP_Bio_-_nerve_cell_signalling - :NerveCells GuidedNotes I...

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