Muscles and Antagonistic Action
Explain how agonists, antagonists and fixators coordinate contraction and relaxation to control movement.
How to prepare for the written examination
Move from accurate theory to a scenario-specific mechanism, consequence, evidence and judgement. Complete all practical performance and NEA work only through authorised centre arrangements.
Core concepts
Concept 1
Skeletal muscle produces force by contracting and pulling on bone through tendons.
Exam cue: Begin with the joint action, then identify the agonist and antagonist.
Concept 2
An antagonistic pair works around a joint: the agonist contracts while the antagonist relaxes to permit the action.
Exam cue: Explain which muscle contracts rather than saying both muscles work.
Concept 3
Roles can reverse when the direction of movement reverses, while fixators stabilise the relevant body part.
Exam cue: Use only the named muscles and pairings required by the current specification.
Risk pitfalls and guardrails
Saying a muscle pushes a bone.
Guardrail: Do not replace explanation with a named sport, an undated current example or practical work that belongs to NEA.
Assuming one muscle is always the agonist in every action.
Guardrail: Do not replace explanation with a named sport, an undated current example or practical work that belongs to NEA.
Confusing tendons, ligaments and muscles.
Guardrail: Do not replace explanation with a named sport, an undated current example or practical work that belongs to NEA.
Memory anchors
Muscle agonist
The prime mover that contracts to produce the stated joint action.
Muscle antagonist
The opposing muscle that lengthens or relaxes to permit the stated action.
Antagonistic pair
Two muscles working oppositely around a joint to control movement.
Muscle fixator
A muscle that stabilises a joint or body part while movement occurs elsewhere.
Tendon connection
A tendon attaches muscle to bone and transmits muscular force.
Checkpoint rule
Do the check-up only after you can summarize each concept in one sentence and identify one dangerous pitfall from memory.
Knowledge Check (after reading)
Short check-up to confirm understanding of this module.
Check-up Questions
What is the agonist in a joint movement?
During elbow flexion in a biceps curl, which muscle is the agonist?
Answer all questions to submit.
Next step personalized recommendations
Continue learning
Move forward only after this module is stable.
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