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Pause to take a quiz on the structure / function of neuron Accepts impulses? Provides insulation? Relays away? Impulses generated (begin)? Two processes? Unit 6 Day 5 Anatomy Great minds have purposes, others have wishes. Washington Irving Today’s Agenda • Review the parts of the brain (using transparency) • Review the parts of the neuron (using drawing on board) • Daily Quiz • Finish viewing Osmosis Jones Unit 6 Day 6 Anatomy The art of being wise is the art of knowing what to overlook. William James Today’s Agenda • Revisit nerves (diagram/ws) • Notes on objectives 4-9 • Video clip on nerves/reflexes • Practice reflex arc labeling Structure of a Nerve (Objective 3) Objective 2: Neuron Structure Objective 2 cont. Objective 4 introduction Objective 4: Membrane Potential Objective 4 • Resting Potential is the electrochemical condition of the neuron that is not firing. Objective 4 • ACTION Potential is the electrochemical condition of the neuron that is firing. Neural Conduction is based on movement of Na and K. Obj. 5: Saltatory Conduction • Movement of neuron impulse that is sped up by the presence of the myelin sheaths. Much faster that unmyelinated conduction. Myelin sheaths allow faster conduction. Obj.6: Synapse-gap between two neurons. Obj. 6 Continued • Electrical Synapse relay electrical charges across synapse. • Chemical Synapses release neurotransmitters (chemicals) Obj.6: Synapse-gap between two neurons. Objective 7: • Excitatory Postsynaptic potentials make the neuron MORE likely to fire. (raise) • Inhibitory Postsynaptic potentials make the neuron LESS likey to fire.(more -) Objective 8: Neurotransmitters • Function: Transfer the impulse to the next neuron. Objective 8: Neurotransmitters • Acetylcholine • Biogenic Amines • Amino Acids • Peptides –(SEE SEPARATE LISTING) Reflexes: • Purpose: Shorten the body’s response time to specific stimuli. Reflexes: • Reflex Arc: The pathway of a reflex— receptor-sensory neuroninterneuron-motor neuroneffector See transparency