Download MBBS Physiology Presentations 27 Nerve Muscle Physiology Potentials Across The Membrane Lecture Notes

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Contents

. Electrotonic potentials
. Properties of graded potentials
. Types of stimuli

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. Strength ? Duration
. Action potential
. Compound action potential
Electrotonic or Graded potential

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Properties of Graded Potential

. Graded in nature
. Decremental conduction
. Depolarizing or Hyperpolarizing nature

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. Summation
Types of Stimuli

. Threshold stimuli
. Subthreshold stimuli

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. Suprathreshold stimuli

Strength ?Duration curve
A.L.Hodgkin

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A.F. Huxley

John C. Eccles

. Graded Potential

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. Action Potential

1. Amplitude is

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1. Amplitude remains

proportionate to the

strength of stimulus

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same

2. Decremental: amplitude 2. Conducted in Al or

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decreases with time

none manner

and distance

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3. Can be summated

3. Cannot be summated

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4. Depolarizing or

4. Large depolarizing

hyperpolarizing

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potential

5. Has threshold and

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5. No threshold or

refractory period

refractory period

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6. Due to ligand gated or

6. Due to opening of

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leaky channels opening

voltage gated channels

Compound Action Potential

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