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 solve the question "Which of the following is correct?", we will analyze each option one by one based on the information provided in the video transcript.

### Step-by-Step Solution:

1. **Evaluate the First Option:**
- The statement claims that hydrogen ions are released from carbonic acid and hemoglobin to form hemoglobinic acid.
- This statement is **correct**. When carbon dioxide enters the blood, it combines with water to form carbonic acid, which dissociates to release hydrogen ions. These hydrogen ions can then react with hemoglobin to form hemoglobinic acid.

2. **Evaluate the Second Option:**
- The statement claims that oxyhemoglobin of erythrocytes is alkaline.
- This statement is **incorrect**. Oxyhemoglobin is actually slightly acidic due to the presence of bound hydrogen ions.

3. **Evaluate the Third Option:**
- The statement claims that more than 70% of carbon dioxide is transferred from tissues to lungs to form carboamino compounds.
- This statement is **incorrect**. In reality, about 20-30% of carbon dioxide is transported as carboamino compounds. The majority (around 70%) is transported as bicarbonate ions.

4. **Evaluate the Fourth Option:**
- The statement claims that in a healthy person, the hemoglobin content is more than 25 grams per 100 milliliters.
- This statement is **incorrect**. The normal hemoglobin content in healthy individuals is approximately 12 to 16 grams per 100 milliliters.

### Conclusion:
After evaluating all options:
- The **first option** is the only **correct statement**.