Which statements are incorrect for mechanism of nerve impulse conduction along electrical junctions of nerous or electrical synapse?
i Nerve impulse flow directly from one neuron to other across the synapses in electrical synapses
ii. Transmission of an impulse across electrical synapses is very similar to impulse conduction along a single axon
iii. Impulse transmission across an elecetrical synapse is always faster than that across a chemical synapse.
iv. Electrical synapses are rare in our system
v. At an electrical synapse, the membranes of the pre and post-synaptic neurous are separated by a fluid-filled space called synaptic cleft is thick.
vi. Chemicals called neurotransmitters are involved in the transmission of impulses at this synapse

Options

A. i, ii and v
B. iii, v and vi
C. ii, iii, iv and vi
D. v and vi

Answer

To determine which statements are incorrect regarding the mechanism of nerve impulse conduction along electrical junctions (or electrical synapses), we will analyze each statement one by one.

### Step-by-Step Solution:

1. **Statement i**: "Nerve impulse flow directly from one neuron to other across the synapses in electrical synapses."
- **Analysis**: This statement is correct. In electrical synapses, the nerve impulses do flow directly from one neuron to another through gap junctions, allowing for rapid communication.

**Hint**: Think about how electrical synapses differ from chemical synapses in terms of direct communication.

2. **Statement ii**: "Transmission of an impulse across electrical synapses is very similar to impulse conduction along a single axon."
- **Analysis**: This statement is also correct. The transmission of impulses in electrical synapses is indeed similar to the conduction along a single axon, as both involve the flow of ions.

**Hint**: Consider the mechanisms of ion flow in both electrical synapses and axons.

3. **Statement iii**: "Impulse transmission across an electrical synapse is always faster than that across a chemical synapse."
- **Analysis**: This statement is correct. Electrical synapses allow for faster transmission of impulses compared to chemical synapses, where neurotransmitter release and binding take time.

**Hint**: Reflect on the speed of transmission in electrical versus chemical synapses.

4. **Statement iv**: "Electrical synapses are rare in our system."
- **Analysis**: This statement is correct. Electrical synapses are indeed less common than chemical synapses in the nervous system.

**Hint**: Think about the prevalence of different types of synapses in biological systems.

5. **Statement v**: "At an electrical synapse, the membranes of the pre and post-synaptic neurons are separated by a fluid-filled space called synaptic cleft is thick."
- **Analysis**: This statement is incorrect. In electrical synapses, the membranes of the neurons are connected by gap junctions and do not have a significant synaptic cleft like in chemical synapses.

**Hint**: Consider the structural differences between electrical and chemical synapses.

6. **Statement vi**: "Chemicals called neurotransmitters are involved in the transmission of impulses at this synapse."
- **Analysis**: This statement is also incorrect. Neurotransmitters are involved in chemical synapses, not electrical synapses, where direct ion flow occurs instead.

**Hint**: Recall the role of neurotransmitters in chemical synapses and the absence of such chemicals in electrical synapses.

### Summary of Incorrect Statements:
- The incorrect statements are **v** and **vi**.

### Final Answer:
The incorrect statements regarding the mechanism of nerve impulse conduction along electrical junctions are **v** and **vi**.