A chemosentive area is situated adjacent to respiratory rhythm centre. Whis is highly sensitive to `____________` and `_____________` ions.

Options

A. `O_(2), H^(+)`
B. `CO_(2),OH^(-)`
C. `CO_(2),H^(+)`
D. `CO_(2),O_(2)`

Answer

To solve the question regarding the chemosensitive area adjacent to the respiratory rhythm center, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Location**: The chemosensitive area is located in the medulla oblongata, which is part of the brain that regulates respiratory functions.

2. **Understand the Function**: This area contains chemoreceptors that monitor the chemical composition of the blood.

3. **Determine Sensitivity**: The chemoreceptors in this area are particularly sensitive to changes in certain ions and gases in the blood.

4. **Identify the Key Ions**: The two primary substances that these chemoreceptors are sensitive to are:
- **Carbon Dioxide (CO2)**: An increase in CO2 levels in the blood indicates a need for increased respiration.
- **Hydrogen Ions (H+)**: The concentration of H+ ions is related to the pH of the blood. An increase in H+ ions (which lowers pH) signals the need for respiratory adjustments.

5. **Final Answer**: Therefore, the chemosensitive area is highly sensitive to **carbon dioxide (CO2)** and **hydrogen ions (H+)**.

### Final Answer:
The chemosensitive area is highly sensitive to **CO2** and **H+** ions.

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