HMS, BM EQ-Bank 27 MC Which pair of muscles work together in an agonist-antagonist relationship? Deltoid and trapezius Biceps and gastrocnemius Triceps and biceps brachii Quadriceps and deltoid Show Answers Only \(C\) Show Worked Solution C is correct: Biceps and triceps are antagonists at the elbow – biceps flexes, triceps extends. Other Options: A is incorrect: Work in different regions, not antagonistic B is incorrect: Work at different joints (elbow vs ankle) D is incorrect: Work at different joints (knee vs shoulder)