肌肉如何带动骨骼
How Muscles Move Bones
理解肌肉是成对工作来移动骨骼的：当一块肌肉收缩（变短并拉动）时，另一块肌肉放松；有些肌肉是随意肌（我们可以选择使用它们），而像心脏这样的肌肉是不随意肌（它们自动工作）
Understand that muscles work in pairs to move bones: when one muscle contracts (gets shorter and pulls), the opposite muscle relaxes, and that some muscles are voluntary (we choose to use them) while others like the heart are involuntary (they work automatically)
学习证据 / Evidence
- 演示或描述肱二头肌和肱三头肌如何成对配合，让手臂弯曲和伸直
- 解释随意肌（我们能控制的肌肉）和不随意肌（自动工作的肌肉）之间的区别
- 列举心脏和消化系统的肌肉作为不随意肌的例子
- Demonstrate or describe how biceps and triceps work as a pair to bend and straighten the arm
- Explain the difference between voluntary muscles (we control them) and involuntary muscles (they work automatically)
- Name the heart and muscles of the digestive system as examples of involuntary muscles
评估问题 / Assessment
{{name}}能弯曲手臂，并说明是一块肌肉在拉动、另一块在放松吗？他们能解释心脏肌肉不需要自己思考就会自动工作吗？
Can {{name}} bend their arm and explain that one muscle is pulling while the other is relaxing — and that their heart muscle works without them thinking about it?