The document discusses membrane potentials in nerve and muscle cells. It explains that cells maintain a resting membrane potential due to different ion concentrations inside and outside the cell. When a cell is stimulated, an action potential is generated where the membrane potential rapidly changes. During an action potential, the membrane potential becomes more positive, reaching a threshold for activation and then repolarizes back to the resting potential. Action potentials allow signals to be transmitted rapidly along nerve and muscle cells.

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

7. OCT26,
2022
Dr.Najma
Mohamed

8. OCT26,
2022
Dr.Najma
Mohamed

9. OCT26,
2022
Dr.Najma
Mohamed

10. RESTING MEMBRANE POTENTIAL
OCT26,
2022
Dr.Najma
Mohamed

11. OCT26,
2022
Dr.Najma
Mohamed

12. OCT26,
2022
Dr.Najma
Mohamed

13. OCT26,
2022
Dr.Najma
Mohamed

14. OCT26,
2022
Dr.Najma
Mohamed

15. OCT26,
2022
Dr.Najma
Mohamed

16. OCT26,
2022
Dr.Najma
Mohamed

17. OCT26,
2022
Dr.Najma
Mohamed

18. OCT26,
2022
Dr.Najma
Mohamed

19. OCT26,
2022
Dr.Najma
Mohamed

20. OCT26,
2022
Dr.Najma
Mohamed

21. OCT26,
2022
Dr.Najma
Mohamed

22. OCT26,
2022
Dr.Najma
Mohamed

23. OCT26,
2022
Dr.Najma
Mohamed

24. OCT26,
2022
Dr.Najma
Mohamed

25. OCT26,
2022
Dr.Najma
Mohamed

26. PROPERTIES OF ACTION POTENTIAL
OCT26,
2022
Dr.Najma
Mohamed

27. OCT26,
2022
Dr.Najma
Mohamed

28. OCT26,
2022
Dr.Najma
Mohamed

29. OCT26,
2022
Dr.Najma
Mohamed

30. OCT26,
2022
Dr.Najma
Mohamed

31. Thank you guys
OCT26,
2022
Dr.Najma
Mohamed