Which of the following statement is correct.
(A) The electrical potential difference across the polarised plasma membrane is called as action potential in resting stage.
(B) `Na^+` ion is responsible for generating an action potential.
(C) The impulse is action potential

Options

A. A & B
B. B & C
C. C & A
D. All

Answer

To determine which statement is correct, let's analyze each of the given statements step by step.

### Step 1: Analyze Statement A
**Statement A:** "The electrical potential difference across the polarized plasma membrane is called action potential in resting stage."

- **Explanation:** This statement is incorrect. The electrical potential difference across a polarized plasma membrane at rest is referred to as the "resting potential," not "action potential." Action potential occurs when the membrane is depolarized and is a transient change in membrane potential.

### Step 2: Analyze Statement B
**Statement B:** "`Na^+` ion is responsible for generating an action potential."

- **Explanation:** This statement is partially correct. Sodium ions (`Na^+`) play a crucial role in generating an action potential. When a neuron is stimulated, `Na^+` channels open, allowing sodium ions to flow into the cell, leading to depolarization and the generation of an action potential.

### Step 3: Analyze Statement C
**Statement C:** "The impulse is action potential."

- **Explanation:** This statement is correct. An impulse in the context of neural activity refers to the action potential that travels along the axon of a neuron. Thus, the impulse is indeed synonymous with action potential.

### Conclusion
Based on the analysis:
- Statement A is incorrect.
- Statement B is correct but incomplete as it does not mention the context of depolarization.
- Statement C is correct.

### Final Answer
The correct statements are B and C, making the correct answer option 2: "B and C are correct."

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