Science
Organisms & Life Processes
Conceptual
11–13 yrs
Muscles Work in Pairs
肌肉成对运动
Description
Explain that muscles work in antagonistic pairs — one contracts while the other relaxes — to produce movement, using the bicep and tricep as a key example
Mastery Evidence
- Explains why muscles can only pull, not push
- Describes what happens to the bicep and tricep when the arm is bent and straightened
- Gives another example of an antagonistic muscle pair
Assessment Prompt
If your child bent and straightened their arm, could they explain why two different muscles are needed — one to bend and one to straighten — and which muscle is which?
Prerequisites 1
Joints, Tendons & Ligaments
拮抗肌的概念只有在理解肌肉通过关节附着于骨骼的方式后才有意义
Unlocks 0
No follow-up topics
