What muscle is the primary antagonist in knee flexion?
(1) Hamstrings
(2) Quadriceps
(3) Gastrocnemius
(4) Tibialis
anterior Knee flexion = bending the knee (bringing heel toward buttocks).
Prime movers (agonists) for knee flexion = hamstrings (biceps femoris, semitendinosus, semimembranosus).
Antagonist = the muscle group that does the opposite action (knee extension).
An agonist is a chemical that activates a receptor to produce a biological response.
👉 The main knee extensors are the quadriceps femoris group.
✅ Correct Answer: (2) Quadriceps
Do you want me to also make a quick ch
Hamstrings are primary knee flexors
Gastrocnemius does cross the knee joints so it's a knee flexor
The tibialis is on the shin is involved in dorsiflexion.
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