神经系统

了解神经系统由两部分组成——中枢神经系统（脑和脊髓）以及遍布全身的神经——并且神经信号以极快速度传递，以协调感觉、思考和运动。

Understand that the nervous system has two parts — the central nervous system (brain and spinal cord) and nerves that branch throughout the body — and that nerve signals travel at high speed to coordinate senses, thought, and movement

学习证据 / Evidence

• 说出神经系统的两个部分：中枢神经系统（脑和脊髓）和周围神经系统（遍布全身的神经）。
• 描述反射弧：刺激 → 感觉神经 → 脊髓/大脑 → 运动神经 → 肌肉反应。
• 说明神经信号传递速度极快，因此反射几乎瞬间发生。

• Name the two parts of the nervous system: central (brain + spinal cord) and peripheral (nerves throughout the body)
• Describe the reflex arc: stimulus → sensory nerve → spinal cord/brain → motor nerve → muscle response
• State that nerve signals travel extremely fast, which is why reflexes happen almost instantly

评估问题 / Assessment

{{name}}能解释一下，当手指碰到烫的东西时，信号是如何从手指传到大脑，再传回手部让手缩回去的吗？

Can {{name}} explain how a message travels from their finger to their brain when they touch something hot, and then back to their hand to pull it away?