Complete the following paragraph by selecting the option that gives correct sequence of words.
When a stimulus is applied at a site on the polarised membrane, the membrane at that site becomes freely permeable to (i) ions.It causes rapid influx of (ii) leading to (iii) of the membrane.

Options

A. `{:((i)," " (ii)," "(iii)),(Na^+,K^+,"depolarisation"):}`
B. `{:((i)," " (ii)," "(iii)),(K^+,K^+,"depolarisation"):}`
C. `{:((i)," " (ii)," "(iii)),(K^+,Na^+,"depolarisation"):}`
D. `{:((i)," " (ii)," "(iii)),(Na^+,Na^+,"depolarisation"):}`

Explanation

To solve the question, we need to fill in the blanks in the given paragraph with the correct sequence of words related to the physiological process that occurs when a stimulus is applied to a polarized membrane.

### Step-by-Step Solution:

1. **Understanding the Context**: The question describes a physiological process involving a polarized membrane, typically referring to a neuron at resting potential. When a stimulus is applied, it triggers a series of events.

2. **Identifying the Ions**: The first blank refers to the type of ions that the membrane becomes permeable to when a stimulus is applied. In the context of neuronal action potentials, the primary ions involved are sodium ions (Na⁺).

3. **Influx of Ions**: The second blank refers to the influx of ions that occurs after the membrane becomes permeable. Since we established that the membrane becomes permeable to sodium ions, the influx will also be sodium ions (Na⁺).

4. **Resulting Change**: The third blank describes the result of the influx of sodium ions. The influx of Na⁺ ions causes the membrane potential to change from negative to positive, a process known as depolarization.

5. **Finalizing the Sequence**:
- For the first blank (i): sodium ions (Na⁺).
- For the second blank (ii): sodium ions (Na⁺).
- For the third blank (iii): depolarization.

### Completed Paragraph:
"When a stimulus is applied at a site on the polarized membrane, the membrane at that site becomes freely permeable to (i) sodium ions. It causes rapid influx of (ii) sodium ions leading to (iii) depolarization of the membrane."

### Answer:
The correct sequence of words is:
(i) sodium ions, (ii) sodium ions, (iii) depolarization.

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