UH BIOL 1361 - Neurons and Action Potential (6 pages)

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Neurons and Action Potential



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Neurons and Action Potential

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The 23rd lecture that goes over neurons and action potential.


Lecture number:
23
Pages:
6
Type:
Lecture Note
School:
University of Houston
Course:
Biol 1361 - Intro to Biological Science
Edition:
1

Unformatted text preview:

BIOL 1361 1nd Edition Lecture 23 Outline of Last Lecture I Purpose of Circulatory System Minimize Diffusion Distance II Circulatory System III Open vs Closed IV Vertebrate Circulatory System V Cells VI Vessels VII Flow Rate VIII Fick s Law IX Flow Circuits X Pump Outline of Current Lecture I Neuron Structure II Fig 37 2 III Real Neurons IV Resting Potential V Figure 37 6 VI Description of Ion Movement VII Electrochemical Equilibrium These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute VIII IX Action Potential Graph Current Lecture I Neuron Structure be able to draw this Fig 37 5 a Dendrites i Receive signals from other neurons b Cell body i Contains nucleus and organelles c Axon i Transmits signals to other neurons or muscles II Fig 37 2 a Synapse junction of a nerve cell with another cell b Relative Terms depending on cell location in network i Presynaptic Neuron cell sending signal across synapse ii Postsynaptic Neuron cell receiving signal III Real Neurons Figure 37 3 a Cyan neuron cell bodies b Green dendrites c Red support cells glia IV Resting Potential a Resting Potential charge difference across a cell membrane of ALL body cells b Develops because of Na K movement c Ion movement through 3 membrane proteins i Na K pump requires ATP ii Passive K channels channels are always open facilitated diffusion V Figure 37 6 a There are more potassium channels versus sodium channels b The membrane is more permeable to potassium VI Description of Ion Movement a Na K Pump Pumps 3 Na out and 2 K in to the cell b Result i Na 15 mM inside ii Na 150 mM outside iii K 140 mM inside iv K 5 mM outside c Passive K Channel is always open i K leaves the cell ii Cl and Protein are stuck inside the cell iii Result charge now greater inside the cell iv charge attracts charge on outside electrical gradient limits K efflux outflow VII Electrochemical Equilibrium a X X out RT Eion zF i Eion



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