logging in or signing up ACTION POTENTIAL URASS Download Post to : URL : Related Presentations : Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Uploaded from authorPOINT lite Insert YouTube videos in PowerPont slides with aS Desktop Copy embed code: Embed: Flash iPad Dynamic Copy Does not support media & animations Automatically changes to Flash or non-Flash embed WordPress Embed Customize Embed URL: Copy Thumbnail: Copy The presentation is successfully added In Your Favorites. Views: 5211 Category: Education License: All Rights Reserved Like it (7) Dislike it (6) Added: May 07, 2010 This Presentation is Public Favorites: 5 Presentation Description The mechanism of action potential through a neuron is discussed in this presentation. Comments Posting comment... By: samhithamacheri (3 month(s) ago) yeah exactly can u help us out in downloading this ppt ??? Saving..... Post Reply Close Saving..... 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Edit Comment Close Premium member Presentation Transcript ACTION POTENTIAL IN A NEURON : ACTION POTENTIAL IN A NEURON Presented To: MISS ZUNAIRA NAWAZ Presented By: MUHAMMAD ARSLAN ABDULLAH MUHAMMAD REHAN AZMAT MUHAMMAD USMAN SHAFIQ-UR-REHMAN SAADULLAH Department Of Pharmacy The University Of Lahore Outline : Outline Definition Action potential through a Neuron Stages of Action potential Propagation of Action potential Myelinated Neurons Un-myelinated neurons Conduction Velocity Refractory period ABSOLUTE - Refractory period RELATIVE - Refractory period All or None Principle Summation ACTION POTENTIAL Definition : Definition “An action potential (also known as a nerve impulse or a spike potential) is a self-regenerating wave of electrochemical activity (in response to stimuli) that allows excitable cells (such as muscle and nerve cells) to carry a signal over a distance.” ACTION POTENTIAL Action potential through a Neuron : Action potential through a Neuron Stages of Action potential : Stages of Action potential 3- Stages Stages of Action potential : Stages of Action potential Resting stage inside –ve membrane. Outside +ve membrane. Na+ and K+ Channels are close. Membrane is at rest. This is resting membrane potential. ACTION POTENTIAL Stages of Action potential : Stages of Action potential Depolarization Threshold stimulus (about -60 to -55mV) excite the Na-channels. Na+ Channels Open. Influx of Na+ Stats. Na+ ions Rush in. Inside +ve membrane. Outside -ve membrane. Membrane potential rises from -70mV to +40mV Action Potential or nerve impulse is then generated. ACTION POTENTIAL Stages of Action potential : Stages of Action potential Repolarization Then Na+ Channels Close. At the same time K+ Channels Open Efflux of K+ Stats. Inside again -ve membrane. And Outside +ve membrane. Membrane potential fall to -80mV (called Undershoot) Then Na-K-Pumps Work actively using ATP, to retain the Equilibrium. Sending 3 Na+ out and 2 K+ in to the cell. And restore the mebrane potential of -70mV ACTION POTENTIAL Stages of Action potential Graphical View : Stages of Action potential Graphical View Summary : Summary A Short Video clip Mechanism. Slide 12: ACTION POTENTIAL NOW!How Action potential Propagate? Thruogh : NOW!How Action potential Propagate? Thruogh Myelinated Neurons Un-myelinated neurons Propagation of Action potential Through Myelinated Neurons : Propagation of Action potential Through Myelinated Neurons Through Nodes of ren vier. It is a jumping movement called Saltatory movement. ACTION POTENTIAL Propagation of Action potential Through Un-Myelinated Neurons : Propagation of Action potential Through Un-Myelinated Neurons through each and every part of the membrane. That’s why it is called Contineuous conduction. ACTION POTENTIAL Summary : Summary A Short Video clip Mechanism. Slide 17: ACTION POTENTIAL Refractory period : Refractory period ABSOLUTE - Refractory period RELATIVE - Refractory period ABSOLUTE - Refractory period : ABSOLUTE - Refractory period During an action potential, a second stimulus will not produce a second action potential (no matter how strong that stimulus is) ACTION POTENTIAL ABSOLUTE - Refractory period : ABSOLUTE - Refractory period During an action potential, a second stimulus will not produce a second action potential (no matter how strong that stimulus is) ACTION POTENTIAL RELATIVE - Refractory period : RELATIVE - Refractory period Another action potential can be produced, but only if the stimulus is greater than the threshold stimulus ACTION POTENTIAL All or None Principle : All or None Principle A law stating that - action potentials occur maximally or not at all ACTION POTENTIAL Thank You! : Thank You! THE END ACTION POTENTIAL You do not have the permission to view this presentation. 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ACTION POTENTIAL URASS Download Post to : URL : Related Presentations : Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Uploaded from authorPOINT lite Insert YouTube videos in PowerPont slides with aS Desktop Copy embed code: Embed: Flash iPad Dynamic Copy Does not support media & animations Automatically changes to Flash or non-Flash embed WordPress Embed Customize Embed URL: Copy Thumbnail: Copy The presentation is successfully added In Your Favorites. Views: 5211 Category: Education License: All Rights Reserved Like it (7) Dislike it (6) Added: May 07, 2010 This Presentation is Public Favorites: 5 Presentation Description The mechanism of action potential through a neuron is discussed in this presentation. Comments Posting comment... By: samhithamacheri (3 month(s) ago) yeah exactly can u help us out in downloading this ppt ??? Saving..... Post Reply Close Saving..... Edit Comment Close By: ashulvayesha (6 month(s) ago) plzzzzzz alow me to download this presentataion Saving..... Post Reply Close Saving..... Edit Comment Close By: shah1072 (14 month(s) ago) it is simple aand good ... please alow me to download Saving..... Post Reply Close Saving..... Edit Comment Close By: LOVEROSE (29 month(s) ago) YOUR PRESENTATION IS SO GOOD . CAN I DOWMLOAD IT????????? Saving..... Post Reply Close Saving..... Edit Comment Close Premium member Presentation Transcript ACTION POTENTIAL IN A NEURON : ACTION POTENTIAL IN A NEURON Presented To: MISS ZUNAIRA NAWAZ Presented By: MUHAMMAD ARSLAN ABDULLAH MUHAMMAD REHAN AZMAT MUHAMMAD USMAN SHAFIQ-UR-REHMAN SAADULLAH Department Of Pharmacy The University Of Lahore Outline : Outline Definition Action potential through a Neuron Stages of Action potential Propagation of Action potential Myelinated Neurons Un-myelinated neurons Conduction Velocity Refractory period ABSOLUTE - Refractory period RELATIVE - Refractory period All or None Principle Summation ACTION POTENTIAL Definition : Definition “An action potential (also known as a nerve impulse or a spike potential) is a self-regenerating wave of electrochemical activity (in response to stimuli) that allows excitable cells (such as muscle and nerve cells) to carry a signal over a distance.” ACTION POTENTIAL Action potential through a Neuron : Action potential through a Neuron Stages of Action potential : Stages of Action potential 3- Stages Stages of Action potential : Stages of Action potential Resting stage inside –ve membrane. Outside +ve membrane. Na+ and K+ Channels are close. Membrane is at rest. This is resting membrane potential. ACTION POTENTIAL Stages of Action potential : Stages of Action potential Depolarization Threshold stimulus (about -60 to -55mV) excite the Na-channels. Na+ Channels Open. Influx of Na+ Stats. Na+ ions Rush in. Inside +ve membrane. Outside -ve membrane. Membrane potential rises from -70mV to +40mV Action Potential or nerve impulse is then generated. ACTION POTENTIAL Stages of Action potential : Stages of Action potential Repolarization Then Na+ Channels Close. At the same time K+ Channels Open Efflux of K+ Stats. Inside again -ve membrane. And Outside +ve membrane. Membrane potential fall to -80mV (called Undershoot) Then Na-K-Pumps Work actively using ATP, to retain the Equilibrium. Sending 3 Na+ out and 2 K+ in to the cell. And restore the mebrane potential of -70mV ACTION POTENTIAL Stages of Action potential Graphical View : Stages of Action potential Graphical View Summary : Summary A Short Video clip Mechanism. Slide 12: ACTION POTENTIAL NOW!How Action potential Propagate? Thruogh : NOW!How Action potential Propagate? Thruogh Myelinated Neurons Un-myelinated neurons Propagation of Action potential Through Myelinated Neurons : Propagation of Action potential Through Myelinated Neurons Through Nodes of ren vier. It is a jumping movement called Saltatory movement. ACTION POTENTIAL Propagation of Action potential Through Un-Myelinated Neurons : Propagation of Action potential Through Un-Myelinated Neurons through each and every part of the membrane. That’s why it is called Contineuous conduction. ACTION POTENTIAL Summary : Summary A Short Video clip Mechanism. Slide 17: ACTION POTENTIAL Refractory period : Refractory period ABSOLUTE - Refractory period RELATIVE - Refractory period ABSOLUTE - Refractory period : ABSOLUTE - Refractory period During an action potential, a second stimulus will not produce a second action potential (no matter how strong that stimulus is) ACTION POTENTIAL ABSOLUTE - Refractory period : ABSOLUTE - Refractory period During an action potential, a second stimulus will not produce a second action potential (no matter how strong that stimulus is) ACTION POTENTIAL RELATIVE - Refractory period : RELATIVE - Refractory period Another action potential can be produced, but only if the stimulus is greater than the threshold stimulus ACTION POTENTIAL All or None Principle : All or None Principle A law stating that - action potentials occur maximally or not at all ACTION POTENTIAL Thank You! : Thank You! THE END ACTION POTENTIAL