Choose the correct Statement about the transmission of impulses.

Options

A. At electrical synapses , the membranes of pre-and-post synaptic neurons , are situated far form each other .
B. The synaptic vesicles fuse with the plasma membrane and release their neurotransmitters are situated far from each other .
C. The released neurotransmitters bind to their specific receptors, present on the pre-synaptic membrane.
D. Impulse transmission across a chemical synapse is always faster than that across an electrical synapse.

Answer

To solve the question regarding the correct statement about the transmission of impulses, we will analyze each of the provided options based on the information about synapses.

### Step-by-Step Solution:

1. **Understanding Synapses**:
- A synapse is a junction between two neurons where the transmission of impulses occurs. There are two main types of synapses: electrical and chemical.

2. **Analyzing the Options**:
- **Option A**: "At electrical synapses, the membranes of pre and post synaptic neurons are situated far from each other."
- This statement is **incorrect**. In electrical synapses, the membranes of the pre-synaptic and post-synaptic neurons are very close together, allowing direct electrical current flow.

- **Option B**: "The synaptic vesicles fused with plasma membranes and release their neurotransmitter are situated far from each other."
- This statement is **correct**. In chemical synapses, synaptic vesicles containing neurotransmitters are located in the pre-synaptic neuron and release neurotransmitters into the synaptic cleft, which is the space between the pre-synaptic and post-synaptic membranes.

- **Option C**: "The released neurotransmitter bind to their specific receptors present on the pre-synaptic membrane."
- This statement is **incorrect**. The neurotransmitters bind to specific receptors located on the post-synaptic membrane, not the pre-synaptic membrane.

- **Option D**: "Impulse transmission across a chemical synapse is always faster."
- This statement is **incorrect**. Impulse transmission across chemical synapses is generally slower than that across electrical synapses due to the time taken for neurotransmitter release and binding.

3. **Conclusion**:
- After analyzing all the options, the correct statement about the transmission of impulses is **Option B**.

### Final Answer:
The correct statement about the transmission of impulses is: **The synaptic vesicles fused with plasma membranes and release their neurotransmitter are situated far from each other.**

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