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Question

The blood leaving the tissues becomes richer in :


A
Carbon dioxide
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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 - $$Glucose + O_2 \rightarrow ATP + CO_2$$

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.

Biology

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