synaptic transmission
Overview
Synaptic transmission is the process by which neurons communicate with each other, typically involving the release of chemical neurotransmitters across a synapse. This intricate mechanism ensures the precise and unidirectional flow of information within the nervous system, enabling complex functions like thought, movement, and sensation.
Structure of a Synapse
A synapse is a specialized junction that facilitates communication between neurons. It consists of three main components: * **Presynaptic Terminal:** This is the end of the axon of the transmitting neuron. It contains numerous **synaptic vesicles**, which are small sacs filled with **neurotransmi...
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Key Concepts
- Synapse: The junction between two neurons (or a neuron and an effector cell) where information is transmitted.
- Neurotransmitter: Chemical messenger released from the presynaptic neuron that diffuses across the synaptic cleft and binds to receptors on the postsynaptic neuron.
- Presynaptic Neuron: The neuron transmitting the signal, releasing neurotransmitters.
- Postsynaptic Neuron: The neuron receiving the signal, containing receptors for neurotransmitters.
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Exam Tips
- →Clearly distinguish between the roles of calcium ions (Ca²⁺) in neurotransmitter release and sodium ions (Na⁺) in generating an action potential.
- →Be able to draw and label a diagram of a synapse, indicating the presynaptic terminal, synaptic cleft, postsynaptic membrane, vesicles, receptors, and mitochondria.
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