Conduction speed of impulse is

Options

A. more across an electrical synapse
B. more across a chemical synapse
C. equal in both chemical and electrical synapses
D. equal to that of actiona potentials

Answer

**Step-by-Step Solution:**

1. **Understanding Conduction of Nerve Impulses**: The conduction of a nerve impulse refers to the process by which a nerve signal is transmitted along the nerve fibers. This involves physiological changes that occur in response to stimuli.

2. **Types of Stimuli**: The stimuli that can trigger nerve impulses can be mechanical (like touch), chemical (like neurotransmitters), or electrical (like changes in membrane potential).

3. **Definition of Conduction Speed**: The conduction speed of an impulse is the rate at which the nerve impulse travels along the nerve fiber. This speed can vary depending on several factors, including the type of nerve fiber and whether the impulse is traveling through myelinated or unmyelinated fibers.

4. **Myelination and Conduction Speed**: Myelinated fibers have a fatty sheath (myelin) that insulates the nerve fiber and allows impulses to jump between nodes of Ranvier (saltatory conduction), which significantly increases the conduction speed compared to unmyelinated fibers.

5. **Electrical vs. Chemical Impulses**: The conduction of nerve impulses is primarily electrical in nature. While chemical signals (like neurotransmitters) play a role in transmitting signals across synapses, the actual conduction along the nerve fiber is due to electrical impulses.

6. **Conclusion**: Therefore, the conduction speed of an impulse is greater in electrical synapses compared to chemical synapses. The correct answer to the question regarding the conduction speed of impulse is that it is more across electrical impulses.

**Final Answer**: The conduction speed of impulse is greater across electrical impulses.

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