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chapter 4 Membrane action potential.ppt
1. MEMBRANE ACTION POTENTIAL
Dr.Najma Mohamed
MBBS PGY1 family medicine MD
Amoud-Hope Program
Residence at Borama Regional Hospital
Amoud University
OCT26,
2022
Dr.Najma
Mohamed
2. INTRODUCTION
◦ Electrical potentials exist across the
membranes of virtually all cells of the body.
◦ In addition, some cells, such as nerve and
muscle cells, are capable of generating
rapidly changing electrochemical impulses at
their membranes, and these impulses are
used to transmit signals along the nerve or
muscle membranes
OCT26,
2022
Dr.Najma
Mohamed
3. CON…
◦ In still other types of cells, such as glandular
cells, macrophages, and ciliated cells, local
changes in membrane potentials also
activate many of the cells’ functions.
◦ The present discussion is concerned with
membrane potentials generated both at rest
and during action by nerve and muscle cells.
OCT26,
2022
Dr.Najma
Mohamed
4. DIFFUSIONPOTENTIAL AND EQUILIBRIUM POTENTIAL
The potential difference between inside and outside
of the cell is called ( diffusion potential)
When the net of concentration reached and there is
no ion movement the equilibrium potential is reached
.
OCT26,
2022
Dr.Najma
Mohamed
5. Equilibrium potential isthe diffusion potential
that exactly balances (opposes) the tendency
for diffusion caused by a concentration
difference.
OCT26,
2022
Dr.Najma
Mohamed
6. THE NERST POTENTIAL
The diffusion potential level across a membrane that
exactly opposes the net diffusion of a particular ion
through the membrane is called the ( Nerst potential)
OCT26,
2022
Dr.Najma
Mohamed
