身体如何保持平衡

解释稳态是维持身体内部环境稳定的过程；以血糖调节（胰岛素/胰高血糖素）和体温调节为具体例子，描述主要的负反馈回路系统；并将内分泌系统（分泌激素的腺体）与神经系统联系起来，说明它们是如何互补的通讯系统，且速度和持续时间各不相同。

Explain homeostasis as the process of maintaining a stable internal environment; describe the main feedback loop systems (negative feedback) using blood glucose regulation (insulin/glucagon) and body temperature as concrete examples; and connect the endocrine system (hormone-secreting glands) to the nervous system as two complementary communication systems with different speeds and durations

学习证据 / Evidence

• 定义稳态，并解释为什么维持稳定的内部环境对生存至关重要。
• 描述血糖负反馈回路：血糖升高→胰腺释放胰岛素→细胞摄取葡萄糖→血糖下降→胰岛素分泌停止。
• 比较神经系统（快速、电信号、持续时间短）与内分泌系统（较慢、化学信号、持续时间长），并各举一个更适用的例子。

• Defines homeostasis and explains why maintaining a stable internal environment is essential for survival
• Describes the blood glucose negative feedback loop: glucose rises → pancreas releases insulin → cells take up glucose → glucose falls → insulin release stops
• Compares the nervous system (fast, electrical, short-duration signals) with the endocrine system (slower, chemical, longer-duration signals) and gives an example where each is more appropriate

评估问题 / Assessment

如果{{name}}吃了一顿含糖量很高的大餐，并且被问到身体如何防止血糖升得过高，ta能解释胰岛素的作用并描述反馈系统如何让血糖恢复正常吗？

If {{name}} ate a large meal of sugary food and was asked what their body does to keep blood sugar from getting dangerously high, could they explain the role of insulin and describe how the feedback system brings levels back to normal?