Question

The blood leaving the tissues becomes richer in :

• A. Carbon dioxide
• B. Water
• C. Hemoglobin
• D. Oxygen

Answer 1

The correct option is A Carbon dioxide

Hint - Tissues perform cellular respiration and produce energy and releases some gas in the form of by-product.

Part 1 - Cellular Respiration

• Cells in our body perform cellular respiration to produce energy using glucose and oxygen as a precursor. In this process, carbon dioxide is produced as a by-product.
• Chemical reaction - $Glucose+O_2\to ATP+C{O}_2$

Part 2 - Gaseous exchange

• At tissue, the oxygen for the respiration comes from the haemoglobin present in the blood cells.
• After the cellular respiration, the cells of the tissue releases carbon dioxide.

Part 3 - Conclusion

• The blood entering the tissue has a higher concentration of oxygen as compared to carbon dioxide.
• Thus, the blood leaving the tissues has a higher concentration of carbon dioxide.

Final step - The blood leaving the tissues becomes richer in carbon dioxide.

So, the correct answer is option A.