All the following structure are found in an electrical synapse except

Options

A. Gap junction
B. Synaptic vesicles
C. Presynaptic membrane
D. Post - synaptic membrane

Answer

To solve the question, "All the following structures are found in an electrical synapse except," we need to identify the structures typically associated with electrical synapses and determine which one is not present.

### Step-by-Step Solution:

1. **Understanding Electrical Synapses**:
- Electrical synapses are specialized junctions that allow direct electrical communication between neurons. They are characterized by the presence of gap junctions.

2. **Identifying Key Structures**:
- **Gap Junctions**: These are channels that allow ions and small molecules to pass directly from one neuron to another, facilitating rapid communication.
- **Presynaptic Neuron**: This is the neuron that sends the signal. In electrical synapses, it is connected to the postsynaptic neuron via gap junctions.
- **Postsynaptic Neuron**: This is the neuron that receives the signal. Like the presynaptic neuron, it is also connected via gap junctions.

3. **Identifying the Exception**:
- **Synaptic Vesicles**: These are membrane-bound structures that store neurotransmitters in chemical synapses. However, they are not present in electrical synapses because electrical synapses do not rely on neurotransmitter release for signal transmission.

4. **Conclusion**:
- Based on the above analysis, the structure that is not found in an electrical synapse is **synaptic vesicles**.

### Final Answer:
The correct option is **synaptic vesicles**.

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