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What happens at the synapse between two ...

What happens at the synapse between two neurons?

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### Step-by-Step Solution: 1. **Definition of Synapse**: A synapse is the junction between two neurons where communication occurs. It consists of a small gap called the synaptic cleft. 2. **Signal Activation**: When an electrical signal (action potential) reaches the end of a neuron (the presynaptic neuron), it triggers the activation of synaptic vesicles that contain neurotransmitters. 3. **Calcium Ion Influx**: The arrival of the action potential causes calcium channels in the presynaptic neuron to open. Calcium ions (Ca²⁺) flow into the neuron from the extracellular space. ...
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