Muscles Work in Pairs

CONCEPTUAL

Science›Organisms & Life Processes|Ages 11—13|ID: mt_lm0usBAF53

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 [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?”

Curriculum Standards1 alignment

KS3.Sci.Bio.SkeletalMuscular.3The national curriculum in England

Function of muscles

the function of muscles and examples of antagonistic muscles

Science · KS3

Prerequisites1

Joints, Tendons & Ligaments
hardAges 11—13

Show full prerequisite tree

Joints, Tendons & Ligaments hard
Antagonistic muscles only make sense in the context of how muscles attach to bones via joints
- The Human Skeleton hard
  Understanding joints, tendons and ligaments requires first knowing skeletal structure and function
  - Cells to Organ Systems soft
    The skeleton is an organ system — understanding this level of organisation gives context
    - Plant Cells vs Animal Cells hard
      The cell-to-organism hierarchy builds on understanding that different cell types exist
      - Parts of Plant and Animal Cells hard
        Comparing plant and animal cells requires knowing the components found in each
        
        Cells Under the Microscope hard
        Understanding cell components requires first knowing that cells are the fundamental unit of life
  - Skeletons & Muscles hard
    KS3 skeleton detail (blood cell production, biomechanics) extends KS2 skeleton and muscles introduction
    - Body Parts & Senses soft
      Knowing body parts and senses supports understanding skeleton protects organs
      - Animal Body Groups soft
        Comparing animal structures supports understanding own body parts
        
        Naming Common Animals hard
        Must know animal groups before comparing body structures
    - Animal Body Groups hard
      Must compare animal body structures before learning about skeleton/muscle system specifically
      - Naming Common Animals hard
        Must know animal groups before comparing body structures
    - Bones & Muscles soft
      Enrichment knowledge of skeleton and muscles supports formal curriculum study of skeletons for support, protection, movement

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