Which of the following is correct ?

Options

A. The `H^+` released from carbonic acid and haemoglobin to form haemoglobinic acid.
B. Oxyhaemoglobin of erythrocytes is alkaline .
C. More than 70% of carbon dioxide is transferred from tissue to the lungs to form carbamino compounds .
D. In a healthy person , the haemoglobin content is more than 25gm per 100 mL .

Answer

To determine which of the given statements is correct, we will analyze each statement one by one.

### Step-by-Step Solution:

1. **Statement 1**: "The H plus released from carbonic acid and hemoglobin to form hemoglobinic acid."
- **Analysis**: This statement is correct. When carbonic acid dissociates, it releases hydrogen ions (H+). These H+ ions can combine with hemoglobin to form hemoglobinic acid (also known as reduced hemoglobin). This process occurs in red blood cells (RBCs) and is part of the buffering system that helps maintain pH balance in the blood.

2. **Statement 2**: "Oxyhemoglobin of erythrocyte is alkaline."
- **Analysis**: This statement is incorrect. Oxyhemoglobin, which is hemoglobin bound to oxygen, is actually slightly acidic in nature. The dissociation of oxygen from hemoglobin is influenced by pH, and a lower pH (more acidic) promotes oxygen release from hemoglobin.

3. **Statement 3**: "More than 70 percent of the carbon dioxide is transferred from the tissue to lung to form carbonyl compound."
- **Analysis**: This statement is also incorrect. More than 70% of carbon dioxide is transported in the blood as bicarbonate ions (HCO3-) rather than as carbonyl compounds. The majority of CO2 reacts with water to form carbonic acid, which then dissociates into bicarbonate and hydrogen ions.

4. **Statement 4**: "In a healthy person, the hemoglobin content is more than 25 gm per 100 ml."
- **Analysis**: This statement is incorrect. The normal hemoglobin concentration in healthy adults is typically between 12 to 20 grams per 100 ml of blood. For men, it ranges from approximately 13.5 to 17 grams per deciliter, and for women, it ranges from 12.0 to 15.5 grams per deciliter.

### Conclusion:
After analyzing all four statements, we find that **Statement 1 is the only correct statement**.

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