高雄醫學大學（後西醫）
108年
普通生物及生化概論
第 39 題
Which of the following statements about human respiration is true?
- A Most of the carbon dioxide in the blood is bound to hemoglobin.
- B Increased pH level decreases affinity of hemoglobin for $O_2$ and improves the unloading reaction.
- C At normal systemic venous $P_{O_2}$, about 25% of the hemoglobin is in the form of oxyhemoglobin.
- D Surfactants can increase the surface tension of the lungs.
- E During an unforced exhalation, alveolar pressure is greater than atmospheric pressure.
思路引導 VIP
請試著想像一個充飽氣的氣球：當你鬆開氣球口的一瞬間，氣球內的空氣會往哪裡流動？根據氣體總是從高壓處流向低壓處的物理特性，這說明了在此刻，氣球內部的壓力與外界大氣壓相比，哪一個會比較高呢？