During transport of carbon dioxide, blood does not become acidic due to:
Correct answer: A. Blood buffer
- A. Blood buffer
- B. Neutralization of H2CO3 by Na2CO3
- C. Absorption by leukocytes
- D. Non-accumulation
Explanation
During the transport of carbon dioxide, the blood does not become acidic due to the presence of buffering systems in the blood.When carbon dioxide (CO2) is produced by the body's cells, it diffuses into the blood and combines with water (H2O) to form carbonic acid (H2CO3). Carbonic acid then dissociates into bicarbonate ions (HCO3-) and hydrogen ions (H+), which can contribute to the acidity of the blood if not properly regulated. However, the body has several buffering systems that can help maintain the pH of the blood within a narrow range, even in the presence of excess CO2. One of the most important buffering systems is the bicarbonate buffer system, which involves the reversible reaction between carbonic acid and bicarbonate ions.
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About Gaseous Exchange in Lungs
Gaseous exchange in the lungs occurs across the thin, moist alveolar and capillary surfaces, where oxygen and carbon dioxide diffuse down partial pressure gradients. The topic covers alveolar adaptations, ventilation, the role of haemoglobin in oxygen transport, carbon dioxide carriage, and the difference between external gas exchange and cellular respiration.
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