The increase in pH of blood has ________ effect on the oxygen carrying capacity of haemogolobin?
Correct answer: A. plus ve
- A. plus ve
- B. - ve
- C. No
- D. All of these
Explanation
An increase in blood pH increases haemoglobin's affinity for oxygen, so its oxygen-carrying capacity rises. This is part of the Bohr effect, in which lower pH promotes oxygen unloading in active tissues and higher pH favours oxygen binding. Students may choose negative because they remember that increased carbon dioxide lowers pH, but the question asks about the direct effect of increased pH.
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About Human Respiratory System
The human respiratory system conducts air to the alveoli, where oxygen and carbon dioxide exchange occurs across thin respiratory surfaces. Questions cover the nasal passage, trachea, bronchi, lungs, diaphragm and intercostal muscles, ventilation mechanics and gas transport, while distinguishing breathing and gaseous exchange from cellular respiration.
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