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Unformatted text preview: BRAIN Last time Resting potential o Non-active neuron o Inside: protein, high amounts of potassium and low amounts of Na+ and Cl; -70 mu o Outside: high amounts of Na+ and Cl- o This is because of Electrical Chemical Na+/K pump Action Potential Figure 1 Firing of neuron depends on ion exchange Figure 2 Figure 3 o It doesnt happen in the myelin because potassium and sodium needs to go in and out o If it does happen in the myelin, it will be slower o If its covered in myelin, we wouldnt have an action potential o It happens between the gaps Figure 4 o Receptor is a channel Figure 5 Figure 6 o Neurotransmitters open channels o Axon hillock opens up based on voltage o NT Na+ channels stimulate NT o NT K+ will not fire o NT Cl- will not fire (its more negative outside, and when the channels open, it will go in, but it remains resting) Neurotransmission o Electro-chemical 1. NT to be synthesized (in the nucleus) 2. transported down the axon (already packed in the vesicles)...
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- Fall '08