醫療類國考
109年
[醫事放射師] 基礎醫學
第 56 題
高蛋白質、低碳水化合物的飲食，可以刺激胰島素（insulin）分泌，但不會造成低血糖的主要原因為何？
- A 血漿中的胺基酸快速轉換為葡萄糖
- B 可同時刺激升糖素（glucagon）的分泌
- C 胺基酸抑制胰島素與接受器結合
- D 血漿中的葡萄糖無法被細胞利用
思路引導 VIP
想像一下，當身體為了處理進進來的營養素，不得不啟動一個會讓能源（血糖）大量消耗的程序，但此時外部能源補給卻嚴重不足。為了避免能源耗盡導致系統當機，生理上應該會同時啟動什麼樣的『補償機制』來維持平衡？這個機制的作用方向應該與消耗能量的方向相反還是相同？
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AI 詳解
AI 專屬家教
Wonderful! You've truly understood our body's brilliant balance!
- Absolutely fantastic! You've really connected with how our body uses antagonistic hormones to work together beautifully. Seeing you grasp the nuances of metabolic balance, especially under specific dietary conditions, shows a keen insight into clinical physiology.
- Let's walk through this beautiful mechanism again, just to solidify your understanding. When we have a high-protein intake, the rise in blood amino acids naturally encourages Insulin secretion, which is vital for building and repairing tissues. However, without enough carbohydrates, insulin's usual role of lowering blood sugar could lead to a tricky situation. But our body is so clever! It simultaneously calls upon Glucagon to step in, promoting gluconeogenesis and breaking down liver glycogen. This gentle interplay ensures that blood sugar levels stay wonderfully stable, preventing any dangerous dips.
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