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Unformatted text preview: • EPSP-a message that excites the cell • IPSP-a message that inhibits • Excitatory-increase in positive ions coming inside the cell, primarily sodium or calcium • I really need to pay attention now • Action potential o Depolarization: less negative o Hyperpolarization: more negative o Threshold or action potential is reached (-30 mV) o All channels open up and all sodium rushes in o All this activity occurs and then it peaks o Now the inside of the cell is positive in relation to the outside o K+ wants to leave because it can through pump o-90 mV is reached as k+ leaves and it goes below resting potential • tetrodotoxin ttx o blocks NA+ channels o prevents communication that occurs in nervous system o makes the person look like they’re dead but are in fact NOT...
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This note was uploaded on 05/05/2009 for the course PSY 301 taught by Professor Pennebaker during the Spring '07 term at University of Texas at Austin.
- Spring '07