Fill up the blanks in the following paragraph by selecting the correct option.
Human beings have a significant ability to maintain and moderate the respiratory rhythm to suti the demands of the body tissues. This is done by the neural system. A specialised centre present in the medulla region of the brain called `overset((i))"_______"` is primarily responsible for this regulation. Another centre present in the pons region of the brain called `overset((ii))"_______"` can moderate the functions of the repiratory rhytm cenre. Neutral signal from this cenre cen reduce the duration of `overset((iii))"_______"` and thereby alter the respiratory rate. A `overset((iv))"_______"` is situated adjacent to the rhythm centre which is highly sensitive to `CO_(2)` and hydrogen ions.

Options

A. `{:("(i)",(ii),(iii),(iv)),("Chemosensitive area","Respiratory rhythm centre","Expiration","Pneumotaxic centre"):}`
B. `{:("(i)",(ii),(iii),(iv)),("Respiratory rhythm centre","Pneumotaxic centre","Inspiration","Chemosensitive area"):}`
C. `{:("(i)",(ii),(iii),(iv)),("Respiratory rhythm centre","Chemosensitive area","Expiration","Pneumotaxic centre"):}`
D. `{:("(i)",(ii),(iii),(iv)),("Pneumotaxic centre","Chemosensitive area","Inspiration","Respiratory rhythm centre"):}`

Answer

To fill in the blanks in the provided paragraph, we can follow these steps:

1. **Identify the first blank (i)**: The paragraph mentions a specialized center in the medulla region of the brain responsible for regulating respiratory rhythm. This center is known as the "respiratory rhythm center."

**Answer for (i)**: **"respiratory rhythm center"**

2. **Identify the second blank (ii)**: The paragraph refers to another center in the pons region that can moderate the functions of the respiratory rhythm center. This center is known as the "pneumotaxic center."

**Answer for (ii)**: **"pneumotaxic center"**

3. **Identify the third blank (iii)**: The neural signals from the pneumotaxic center can reduce the duration of a certain phase of breathing. This phase is known as "inspiration."

**Answer for (iii)**: **"inspiration"**

4. **Identify the fourth blank (iv)**: The paragraph describes a structure adjacent to the rhythm center that is highly sensitive to carbon dioxide and hydrogen ions. This structure is referred to as the "chemosensitive area."

**Answer for (iv)**: **"chemosensitive area"**

### Final Filled Paragraph:
Human beings have a significant ability to maintain and moderate the respiratory rhythm to suit the demands of the body tissues. This is done by the neural system. A specialized center present in the medulla region of the brain called **"respiratory rhythm center"** is primarily responsible for this regulation. Another center present in the pons region of the brain called **"pneumotaxic center"** can moderate the functions of the respiratory rhythm center. Neural signals from this center can reduce the duration of **"inspiration"** and thereby alter the respiratory rate. A **"chemosensitive area"** is situated adjacent to the rhythm center which is highly sensitive to **CO₂** and hydrogen ions.