Statement 1 : About `70%` of `CO_(2)` that enters `RBCs` changes into `HCO_(3)^(-)` for transport in plasma to the lungs where it reconverts into `CO_(2)` for elimination.
Statement 2 : About `40%` of `CO_(2)` that enters `RBCs` changes into carbaminohaemoglobin which releases `O_(2)` in the lungs.

Options

A. Both statement 1 and 2 correct.
B. Statement 1 is correct but statement 2 is incorrect.
C. Statement 1 is incorrect but statement 2 is correct.
D. Both statement 1 and 2 incorrect.

Explanation

To analyze the two statements provided in the question, we will break down the process of carbon dioxide (CO2) transport in the blood and evaluate the accuracy of each statement.

### Step-by-Step Solution:

1. **Understanding CO2 Transport**:
- CO2 is transported in the blood from the tissues to the lungs in three main forms:
- **Dissolved in Plasma**: About 7% of CO2 is directly dissolved in the plasma.
- **Carbaminohemoglobin**: Approximately 20-25% of CO2 binds to hemoglobin to form carbaminohemoglobin.
- **Bicarbonate Ion (HCO3^-)**: The majority, about 70% of CO2, is converted into bicarbonate ions in red blood cells (RBCs) for transport.

2. **Evaluating Statement 1**:
- Statement 1 claims that "About 70% of CO2 that enters RBCs changes into HCO3^- for transport in plasma to the lungs where it reconverts into CO2 for elimination."
- This statement is **true**. The process involves the enzyme carbonic anhydrase in RBCs, which catalyzes the reaction of CO2 with water to form carbonic acid (H2CO3), which then dissociates into bicarbonate ions (HCO3^-) and hydrogen ions (H+). The bicarbonate ions are then transported in the plasma to the lungs, where they reconvert back into CO2 for exhalation.

3. **Evaluating Statement 2**:
- Statement 2 states that "About 40% of CO2 that enters RBCs changes into carbaminohemoglobin which releases O2 in the lungs."
- This statement is **incorrect**. As previously mentioned, only about 20-25% of CO2 binds to hemoglobin to form carbaminohemoglobin. Furthermore, while carbaminohemoglobin does release O2, the percentage stated in the statement is inaccurate.

4. **Conclusion**:
- Based on the evaluations, Statement 1 is true, while Statement 2 is false. Therefore, the correct answer is that Statement 1 is correct and Statement 2 is incorrect.

### Final Answer:
- Statement 1: True
- Statement 2: False