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

Download MBBS (Bachelor of Medicine, Bachelor of Surgery) 1st Year, 2nd Year, 3rd Year and Final year Physiology 27 Nerve Muscle Physiology Potentials Across The Membrane PPT-Powerpoint Presentations and lecture notes

POTENTIALS ACROSS

MEMBRANES

Contents

. Electrotonic potentials
. Properties of graded potentials
. Types of stimuli
. Strength ? Duration
. Action potential
. Compound action potential
Electrotonic or Graded potential

Properties of Graded Potential

. Graded in nature
. Decremental conduction
. Depolarizing or Hyperpolarizing nature
. Summation
Types of Stimuli

. Threshold stimuli
. Subthreshold stimuli
. Suprathreshold stimuli

Strength ?Duration curve
A.L.Hodgkin

A.F. Huxley

John C. Eccles

. Graded Potential

. Action Potential

1. Amplitude is

1. Amplitude remains

proportionate to the

strength of stimulus

same

2. Decremental: amplitude 2. Conducted in Al or

decreases with time

none manner

and distance

3. Can be summated

3. Cannot be summated

4. Depolarizing or

4. Large depolarizing

hyperpolarizing

potential

5. Has threshold and

5. No threshold or

refractory period

refractory period

6. Due to ligand gated or

6. Due to opening of

leaky channels opening

voltage gated channels

Compound Action Potential