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4:59 804 d2l.laurentian.ca Quiz 3 0:11:18 elapsed The most important factor in determining the percent oxygen saturation of haemoglobin (= hemoglobin) is a) BPG b) acidity c) the partial pressure of oxygen d) temperature e) the partial pressure of carbon dioxide Question 17 (1 point)

Ask by Maxwell Chang. in Canada
Mar 14,2025

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The most important factor is the partial pressure of oxygen.

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1. The oxygen saturation of hemoglobin indicates how much oxygen is bound to hemoglobin relative to its maximum binding capacity. 2. Although factors like \( \text{BPG} \), acidity, temperature, and the partial pressure of carbon dioxide play roles in influencing the oxygen-hemoglobin dissociation curve, the most crucial factor in determining the percent oxygen saturation is the partial pressure of oxygen itself. 3. As the partial pressure of oxygen increases, more oxygen binds to hemoglobin until it is almost fully saturated. Conversely, a lower partial pressure of oxygen results in less oxygen binding. 4. Therefore, the correct answer is: \( \textbf{c) the partial pressure of oxygen} \)

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The most important factor in determining the percent oxygen saturation of hemoglobin is the partial pressure of oxygen (pO2). As the pO2 increases, hemoglobin binds to oxygen more efficiently, leading to higher saturation levels. This relationship is crucial for understanding how oxygen is transported in the body, especially in high-altitude environments where pO2 is lower. In addition to pO2, factors like temperature and pH can influence hemoglobin's affinity for oxygen, a phenomenon known as the Bohr effect. If you’re looking to ace your quiz, remember that elevated temperatures and decreased pH (more acidic conditions) can reduce hemoglobin’s oxygen binding capacity, helping the body release oxygen more readily in metabolically active tissues.

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