Sep 29 - The Brain

Sep 29 - The Brain - Thursday, September 29, 2011 The Brain...

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Thursday, September 29, 2011 The Brain Review of Neurons Drug Effects Gross Brain Anatomy Next Time: Disorders & Lateralization Read/Scan: Finish Chapter 3 What happens when multiple neurons synapse? How do drugs work? What are the major structures of the brain? Synaptic transmission: a. occurs only in the central nervous system b. occurs instantly c. involves only chemical d. delays e. found in small foreign cars Neurons Semipermeable membrane Charge due to ions (-70 mv) Action potential results from Na+ and K+ exchange Neurons generate action potentials in “All or None” fashion Intensity coded as frequency Synapse Action potential “pushes” vesicles toward gap Neurotransmitters diffuse across gap Lock and key receptors Presynaptic vs. Postsynaptic Graded Potentials at the Dendrites Depolarization EPSP Hyperpolarization IPSP 1
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Thursday, September 29, 2011 Neurotransmitters/Monoamines Acetylcholine (Ach) Norepinephrine (NE) Dopamine (DA) Serotonin (5-HT) Gamma aminobutyric acid (GABA) Drug Effects Increase or decrease amount of transmitter
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Sep 29 - The Brain - Thursday, September 29, 2011 The Brain...

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