WSU BIOLOGY 251 - Synapse Structure (2 pages)

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Synapse Structure

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Synapse Structure


Topic 5-synapses and neuronal integration

Lecture number:
Lecture Note
Washington State University
Biology 251 - Introductory Human Physiology

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BIO 251 1nd Edition Lecture 5 Outline of Last Lecture I Membrane potential II Action potentials III Neuron and the conduction of action potentials IV Graded Potential Outline of Current Lecture I Introduction II Synapse structure III Synaptic function IV Result of synaptic function Current Lecture I Introduction A How is information transferred from neuron to neuron 1 The electrical signal that moves down a neuron must be passed to the next neuron 2 The junction between two neurons is called a synapse II Synapse Structure Fig 8 2 A Axon terminals of presynaptic neuron junction with dendrites cell body of postsynaptic neuron B Synapse is area of communication between neurons with information moving from presynaptic neuron to postsynaptic neuron only C The postsynaptic neuron may receive input from thousands of presynaptic neurons III Synaptic Function Fig 8 2 IPCD Nervous System 2 Synaptic Transmission 6 A Action potential reaches the axon terminal of the presynaptic neuron B which triggers the opening of voltage gated Ca channels and the subsequent entry of Ca into the presynaptic neuron C The entry of Ca into presynaptic neuron causes synaptic vesicles inside the synaptic knob to release neurotransmitters into the synaptic cleft through the process of exocytosis D After diffusing across the synaptic cleft the neurotransmitters bind to receptor sites on the membrane of the postsynaptic neuron E Neurotransmitters are quickly removed from synapse by 1 inactivation by enzymes or by being These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute 2 actively taken back into synaptic knob or by simply 3 diffusing away 4 This occurs to ready the postsynaptic membrane to receive another message IV Result of synaptic function IPCD Nervous System 2 Synaptic Potentials 7 8 9 A Excitatory Postsynaptic Potential EPSP occurs at an excitatory synapse Fig 8 4a 1 Excitatory pre synaptic

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