NERVOUS SYSTEM Maintenance of homeostasis Major regulatory and control center.
NERVOUS SYSTEM AND ACTIVE TRANSPORT Big Ideas: #2 (Homeostasis) & #4 (Interactions)
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Transcript of NERVOUS SYSTEM AND ACTIVE TRANSPORT Big Ideas: #2 (Homeostasis) & #4 (Interactions)
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NERVOUS SYSTEM AND ACTIVE TRANSPORTBig Ideas:
#2 (Homeostasis) & #4 (Interactions)
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Basic Organization of the Nervous System
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Organization of the Brain
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Nervous Tissue
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Functional Unit: Neuron
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Communication Sequence
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Potential in a neuron
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What allows for the potential difference?
The sodium potassium pump uses ATP to maintain a charge differential inside and outside the neuron
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Mechanism for the Sodium Potassium Exchange Pump
• Active Transport• Requires ATP• Movement against
the concentration gradient.
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Role of facilitated diffusion
Movement of ions through gated channels is “down the concentration gradient” or passive
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Action potential: The change in charge that propagates down a nerve cell and allows signals to travel over long distances.
• Watch the action potential animation.• http://outreach.mcb.harvard.edu/animations/
actionpotential_short.swf• While you are watching the animation, draw a nerve impulse and
identify the changes that cause the impulse to occur.
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Action potential graph:
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Propagation down an axon
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Channels are concentrated in nodes of Ranvier
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What happens when the signal gets to the end?
• Signal must cross a space (synapse) between:• 2 neurons• A neuron and a
muscle cell
• Signal changes:• ElectricalChemicalElectrical
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To prepare for the next lecture:• Sketch and label a drawing of a basic nerve synapse.