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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 doesn’t 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 it’s covered in myelin, we wouldn’t 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 (it’s 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
- Psychology, Neurotransmitter, axon hillock, neurotransmitters open channels