A short period during which a nerve is unable to nerve impulse is called :

Options

A. Synaptic delay
B. Refractory period
C. Rsdting potential
D. Critical period

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for a term that describes a short period during which a nerve is unable to generate a nerve impulse.

2. **Identifying Key Terms**: The key terms in the question are "short period," "nerve," and "unable to generate a nerve impulse."

3. **Analyzing the Options**: The options provided are:
- A) Synaptic delay
- B) Refractory period
- C) Resting potential
- D) Critical period

4. **Defining Each Option**:
- **Synaptic Delay**: This refers to the time taken for a nerve impulse to cross a synapse, which is not necessarily a period of unresponsiveness.
- **Refractory Period**: This is the period during which a nerve or muscle cell is unable to respond to stimuli after an action potential has occurred.
- **Resting Potential**: This is the state of a neuron when it is not actively sending a signal, but it is still capable of responding to stimuli.
- **Critical Period**: This term often refers to a developmental stage when certain skills or abilities are most easily acquired, not specifically related to nerve impulse generation.

5. **Selecting the Correct Answer**: The refractory period is specifically characterized by the inability of the nerve or muscle to respond to stimuli, making it the correct answer.

6. **Conclusion**: Therefore, the answer to the question is **B) Refractory period**.

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