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B
Water
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C
Hemoglobin
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D
Oxygen
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Solution
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+O2→ATP+CO2
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.