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Part 2 of Nervous System | Bio141 | Lecture 6 | 1/22/16

by: Gabriella Morales

Part 2 of Nervous System | Bio141 | Lecture 6 | 1/22/16 Bio 141

Marketplace > Pennsylvania State University > Biology > Bio 141 > Part 2 of Nervous System Bio141 Lecture 6 1 22 16
Gabriella Morales
Penn State
GPA 3.3
Biology and Physiology
Dr. Jenelle Malcos

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About this Document

Lecture 6 notes from Bio141
Biology and Physiology
Dr. Jenelle Malcos
Class Notes
PennState, PSU, PennStateUniversity, Bio141, Biology, Jennelle, Malcos, JenelleMalcos
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This page Class Notes was uploaded by Gabriella Morales on Sunday January 24, 2016. The Class Notes belongs to Bio 141 at Pennsylvania State University taught by Dr. Jenelle Malcos in Winter 2016. Since its upload, it has received 106 views. For similar materials see Biology and Physiology in Biology at Pennsylvania State University.


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Date Created: 01/24/16
Part 2 of Nervous System Friday January 22 2016 927 AM I ElectricalChemical Function of Neurons Audi 0 Main theme Neurons use electrical currents to communicate Electrical Potential voltage 0 Concentration gradient of charged particles electrochemical gradient 0 Potential is required to create a current Electrical current 0 Flow of charged particles from one point to another 0 Example of passive transport Ifthere is a gradient of charges you create a voltage 0 Current flow of charged particles from one point to another high to low passive movement 0 Voltage separation of charged particles ECF extra cellular fluid outsidethe cell CF intracellular fluid inside the cell Ifthere is no concentration gradient there is no communication Best way evolution has determines for rapid movement Why the nervous system communicates with electrical currents Electrochemical Gradient Consists of a concentration gradient of charged particles sodiumNA and potassium K ions 0 Two components 0 Chemical gradient uneven distribution of molecules 0 Electrical gradient uneven distribution of charge because molecules are ions 0 Movement of the ions through pro FINISH SLIDE 3 components contribute to an electrochemical gradient 1 NaK protein pumps create a chemical gradient of ions a io l 2 3 Extracellular fluid ECF High sodium ions low potassium ions Intracellular fluid ICF Low sodium ions high potassium ions c Sodium potassium pump lots of sodium outside few inside potassium is vise versa d NaK pump pumps 2 K ions into cell and 3 Na ions outside cell e Inside cell is more negative Leak Channels counteract the movement of ions from the pumps to create a stable but not equal potential Prevents the potential from getting larger and larger and larger Resting membrane potential Where a neuron starts to begin with before it gets excited from a stimulus Us There are more K leak channels than Na leak channels This causes more K to leak out of the cell than Na to leak in so the inner membrane is more negative compared to the outer membrane because ofthe lack of positive ions 0 Not introducing any negative ions justa lack of positive ions Differences in permeability AND trapped anions create an electrical gradient Trapped Anions are trapped in the ICF Sodium wants to get inside cell in terms of its chemical gradient and because of its electrical gradient bc sodium is and the inside is Reinforcement Potassium wants to go from inside to out because of its chemical gradient Different situation because potassium is so it39s going to want to go back to its start point on the inside Contradiction


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