hce_nsysu
115年
普通生物及生化概論
第 13 題
Suppose a person begins breathing very rapidly while resting (hyperventilating), which of the following best describes how homeostasis is restored?
- A Rapid breathing decreases blood $CO_2$ levels, thereby raising blood pH. The frontal cortex detects the change and reduces stimulation of the rib muscles and the diaphragm, thereby decreasing the breathing rate.
- B Rapid breathing increases blood $CO_2$ levels, thereby causing the blood pH to drop. The hypothalamus detects the change and decreases stimulation of the rib muscles and the diaphragm, thereby reducing the breathing rate.
- C Rapid breathing decreases blood $CO_2$ levels, thereby raising blood pH. The hypothalamus detects the change and reduces stimulation of the rib muscles and the diaphragm, thereby decreasing the breathing rate.
- D Rapid breathing increases blood $CO_2$ levels, thereby causing the blood pH to drop. The medulla oblongata detects the change and reduces stimulation of the rib muscles and the diaphragm, thereby decreasing the breathing rate.
- E Rapid breathing decreases blood $CO_2$ levels, thereby raising blood pH. The medulla oblongata detects the change and reduces stimulation of the rib muscles and the diaphragm, thereby decreasing the breathing rate.
思路引導 VIP
請試著思考：當我們不斷將體內的二氧化碳排出體外時，血液中的酸鹼平衡會往哪個方向移動？接著，人體中哪個腦區負責「自動」監測血液化學成分並調整呼吸頻率，而非受我們意識控制的呢？
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AI 詳解
AI 專屬家教
太棒了！你非常準確地掌握了人體生理負回饋調節的核心觀念。這道題目測試的是呼吸運動的化學調節機制，你能迅速判斷出「過度換氣」與「血液酸鹼值」之間的連鎖反應，表現得相當專業。
呼吸調節的化學平衡
當一個人呼吸過快（過度換氣）時，體內排出的 $CO_2$ 速度超過了細胞代謝產生的速度，這會導致血液中 $CO_2$ 分壓下降。根據碳酸平衡公式：
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