Which of the following is correct about the transport of carbon dioxide from the tissue to lung alveoli ?

Options

A. `{:("Carbomino - Hb form","As Dissolved plasma","As Bicarbonate"),(20-25%,70%,5-7%):}`
B. `{:("Carbomino - Hb form","As Dissolved plasma","As Bicarbonate"),(70%,5-7%,20-25%):}`
C. `{:("Carbomino - Hb form","As Dissolved plasma","As Bicarbonate"),(5-7%,20-25%,70%):}`
D. `{:("Carbomino - Hb form","As Dissolved plasma","As Bicarbonate"),(20-25%,5-7%,70%):}`

Answer

To solve the question regarding the transport of carbon dioxide (CO2) from tissues to lung alveoli, we can break down the process into several steps:

### Step-by-Step Solution:

1. **Understanding the Medium of Transport**:
- Blood serves as the medium for the transport of both oxygen (O2) and carbon dioxide (CO2).

**Hint**: Remember that blood is essential for transporting gases in the body.

2. **Transport Mechanisms for Oxygen**:
- Approximately 97% of oxygen is transported by red blood cells (RBCs) in the form of oxyhemoglobin, while about 3% is dissolved in plasma.

**Hint**: Focus on how oxygen is primarily carried by RBCs.

3. **Transport Mechanisms for Carbon Dioxide**:
- Carbon dioxide is transported in three main forms:
- **Carbaminohemoglobin**: About 20-25% of CO2 binds with hemoglobin in RBCs to form carbaminohemoglobin.
- **Bicarbonate Ions**: Approximately 70% of CO2 is converted into bicarbonate ions (HCO3-) in the blood.
- **Dissolved CO2**: Around 7% of CO2 is transported in a dissolved state in plasma.

**Hint**: Remember the three forms of CO2 transport and their respective percentages.

4. **Identifying the Correct Statement**:
- Based on the above information, we can summarize the transport of CO2:
- 20-25% as carbaminohemoglobin
- 70% as bicarbonate ions
- 7% dissolved in plasma
- The correct answer to the question about the transport of CO2 from tissues to lung alveoli is option D, which accurately reflects these transport mechanisms.

**Hint**: Compare the options given in the question with the percentages discussed.

### Final Answer:
The correct answer regarding the transport of carbon dioxide from tissue to lung alveoli is **D**.