BIOELECTRICITY AND EXCITABLE TISSUE
THE RESTING CELL
PPT Slide
BIOELECTRICITY
MOBILITY OF IONS DEPENDS ON HYDRATED SIZE
IONS MOVE WITH THEIR HYDRATION SHELLS
ELECTRONEUTRAL DIFFUSSION
ELECTRICAL POTENTIAL=CHARGE SEPARATION
THE MEMBRANE POTENTIAL
THE ORIGIN OF BIOELECTRICITY
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
PROPAGATION OF THE ACTION POTENTIAL
SALTATORY CONDUCTION
NORMALLY A NERVE IS EXCITED BY A SYNAPSE OR BY A RECEPTOR
THE SYNAPSE
POSTSYNAPTIC POTENTIALS
TEMPORAL SUMMATION
SPATIAL SUMMATION
EPSP-IPSP CANCELLATION
NEURO TRANSMITTERS
Email: mikuleck@hsc.vcu.edu
Home Page: http://views.vcu.edu/~mikuleck/
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