1 Cell Potential Presented by- Md. Bashir Uddin Roll: 1215502 Dept. of BME KUET, Khulna-9203.

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Presentation transcript:

1 Cell Potential Presented by- Md. Bashir Uddin Roll: Dept. of BME KUET, Khulna-9203

Cell Red Blood cells  The basic structural and functional units of all living organisms

Human Cell configuration :  Cell diameter: 1-100microns  Length: 1mm- 1m  Membrane thickness:0.01 micron  Cell surrounded by body fluids  Fluids are ionic and conducting medium of electric potentials

4 States:  Cell polarization.  Cell depolarization  Cell excited  Cell unexcited

 Cell Potential may refer to Membrane Potential  Membrane Potential: The potential across the membrane of a biological cell.

 The concentration of the sodium ion is more on the outside of cell membrane than inside.  In resting state, a cell charges negative along the inner surface of its membrane, on the other hand a positive charge along the outer portion.  Due to unequal charge distribution, an electrochemical reaction occurs within the living cell and produce a potential. This type of potential is called resting potential.  In this condition cell is called polarization cell.

 An action potential is a short-lasting event in which the electrical membrane potential of a cell rapidly rises and falls, following a consistent trajectory.  Action potentials are generated by special types of voltage-gated ion channels embedded in a cell's plasma membrane.  These channels are shut when the membrane potential is near the resting potential of the cell, but they rapidly begin to open if the membrane potential increases to a precisely defined threshold value.

Channels Sodium changes electrochemical (open) ions in gradient Greater electric More channel open Rise in membrane current More sodium ions in potential This process proceeds Channels open Resulting A large upswing in Channels (all available) membrane potential close ( Reverse polarity of membrane potential )

Waves of action potential

 Electrical potentials and currents produced by or occurring within living organisms.  Bioelectric potentials are generated by a variety of biological processes and generally range in strength from one to a few hundred millivolts.  An electric current that is generated by living tissue, such as nerve and muscle is called bioelectricity. Bioelectricity