BIOELECTRICITY AND EXCITABLE TISSUE

7/11/00


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Table of Contents

BIOELECTRICITY AND EXCITABLE TISSUE

THE RESTING CELL

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BIOELECTRICITY

MOBILITY OF IONS DEPENDS ON HYDRATED SIZE

IONS MOVE WITH THEIR HYDRATION SHELLS

ELECTRONEUTRAL DIFFUSSION

ELECTRONEUTRAL DIFFUSSION

ELECTRICAL POTENTIAL=CHARGE SEPARATION

THE MEMBRANE POTENTIAL

THE ORIGIN OF BIOELECTRICITY

THE RESTING CELL

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ACTIVE TRANSPORT

ACTIVE TRANSPORT REQUIRES AN INPUT OF ENERGY

EXCITABLE TISSUES

THE NERVE CELL

EXCITABLE TISSUES:THE ACTION POTENTIAL

EQUILIBRIUM POTENTIALS FOR IONS

THE EQUILIBRIUM MEMBRANE POTENTIAL FOR POTASSIUM IS -90 mV

THE EQUILIBRIUM MEMBRANE POTENTIAL FOR SODIUM IS + 60 mV

THE RESTING POTENTIAL IS NEAR THE POTASSIUM EQUILIBRIUM POTENTIAL

EVENTS DURING EXCITATION

OPENING THE SODIUM CHANNELS ALLOWS SODIUM TO RUSH IN

GRADED VS ALL OR NONE

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PROPAGATION OF THE ACTION POTENTIAL

PROPAGATION OF THE ACTION POTENTIAL

PROPAGATION OF THE ACTION POTENTIAL

PROPAGATION OF THE ACTION POTENTIAL

SALTATORY CONDUCTION

NORMALLY A NERVE IS EXCITED BY A SYNAPSE OR BY A RECEPTOR

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THE SYNAPSE

THE SYNAPSE

THE SYNAPSE

THE SYNAPSE

THE SYNAPSE

THE SYNAPSE

THE SYNAPSE

THE SYNAPSE

POSTSYNAPTIC POTENTIALS

TEMPORAL SUMMATION

TEMPORAL SUMMATION

TEMPORAL SUMMATION

SPATIAL SUMMATION

EPSP-IPSP CANCELLATION

NEURO TRANSMITTERS

Author: Donald C. Mikulecky

Email: mikuleck@hsc.vcu.edu

Home Page: http://views.vcu.edu/~mikuleck/

 

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