Which of the following statement `//` is `//` are correct ?
A- A high concentration of carbonic anhydrase is present in RBC.
B- Minute quantities of carbonic anhydrase is present in plasma.
C-Every 100 ml blood delivers approximately 4 ml of `CO_(2)` to the alveoli.
D- `20-25%` `CO_(2)` is carried by haemoglobin as carbaminohaemoglobin.

Options

A. A,C and D
B. A and D
C. A,B,C and D
D. Only A

Answer

To determine which of the statements A, B, C, and D are correct, let's analyze each statement step by step:

### Step 1: Analyze Statement A
**Statement A:** A high concentration of carbonic anhydrase is present in RBC.

**Explanation:** Carbonic anhydrase is an enzyme that catalyzes the conversion of carbon dioxide and water to bicarbonate and protons. It is indeed found in high concentrations in red blood cells (RBCs) because RBCs play a crucial role in transporting carbon dioxide from tissues to the lungs.

**Conclusion:** **True**

### Step 2: Analyze Statement B
**Statement B:** Minute quantities of carbonic anhydrase are present in plasma.

**Explanation:** While the majority of carbonic anhydrase is found in RBCs, it is also present in the plasma, albeit in much smaller quantities. This statement accurately reflects the distribution of carbonic anhydrase.

**Conclusion:** **True**

### Step 3: Analyze Statement C
**Statement C:** Every 100 ml blood delivers approximately 4 ml of CO₂ to the alveoli.

**Explanation:** It is known that about 20-25% of carbon dioxide in the blood is transported by hemoglobin as carbaminohemoglobin. If we consider the upper limit of 25%, this means that in 100 ml of blood, approximately 4-5 ml of CO₂ can be delivered to the alveoli. Therefore, this statement is also correct.

**Conclusion:** **True**

### Step 4: Analyze Statement D
**Statement D:** 20-25% CO₂ is carried by hemoglobin as carbaminohemoglobin.

**Explanation:** Hemoglobin can bind to carbon dioxide to form carbaminohemoglobin, and it is indeed responsible for transporting about 20-25% of the total carbon dioxide in the blood. This statement is accurate.

**Conclusion:** **True**

### Final Conclusion
All four statements (A, B, C, and D) are correct.

### Summary of Correct Statements:
- **A:** True
- **B:** True
- **C:** True
- **D:** True