Loai Alzghoul Loai.physiology@yahoo.com.

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Loai Alzghoul Loai.physiology@yahoo.com

Neuron F8-2 Axons carry information from the cell body to the axon terminals. Axon terminals communicate with their target cells at synapses.

Signal Transduction at Synapses

Fast Response EPSP

Inhibitory Synapse: K+ Channels

Inhibitory Synapse: Cl- Channels

Graded Potentials F8-9 Graded potentials are depolarizations or hyperpolarizations whose strength is proportional to the strength of the triggering event. Graded potentials lose their strength as they move through the cell due to the leakage of charge across the membrane (eg. leaky water hose).

Graded Potentials Above Threshold Voltage Trigger Action Potentials Graded potentials travel through the neuron until they reach the trigger zone. If they depolarize the membrane above threshold voltage (about -55 mV in mammals), an action potential is triggered and it travels down the axon. F8-10

Neuron F8-2 Axons carry information from the cell body to the axon terminals. Axon terminals communicate with their target cells at synapses.

Synaptic potentials EPSP a IPSP

Action Potential Propagation Dentistry 07

Saltatory Conduction: Action Potential Propagation in a Myelinated Axon Dentistry 07

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