Want this question answered?
The antagonists would be those muscles that cause knee flexion. Hamstrings (biceps femoris, semimembranosus, semitendonosis) are the primary knee flexors, and would thus be antagonists to knee extension.
biceps femoris
The hamstrings biceps femoris vastus medialis vastus intermedius vastus lateralis
The prime mover for knee flexion is biceps femoris, semimembranosus, and semitendinosus. The prime mover for knee extension is the Quadriceps â?? vastus lateralis, vastus medialis, vastus intermedius, and rectus femoris
The Quadriceps extend just like the triceps, which include the rectus femoris, vastus lateralis, vastus medialis, and vastus intermedius. The Hamstrings flex just like the biceps, which include the biceps femoris, semitendinosus, and semimembranosus. Quads extend, Triceps extend Hamstrings flex, arm biceps (biceps brachii, brachialis) flex
Rectus femoris+ anterior thigh; quadriceps+ extension of leg at knee Vastus lateralis+ lateral anterior thigh; quadriceps+ extension of leg at knee Vastus Medialis+ medial anterior thigh; quadriceps+ extension of leg at knee Vastus intermedius+ deep anterior thigh; quadriceps+ extension of leg at knee Sartorius (*) parallel strap-like muscle that crosses thigh flexion of knee forward Biceps femoris* posterior thigh; hamstring* flexion of leg at knee Semitendinosus* posterior thigh; hamstring* flexion of leg at knee Semimembranosus* posterior thigh; hamstring* flexion of leg at knee
When the biceps contracts the triceps relaxes slowly. It happens when your arm is bent.
Extension of the forearm at the elbow joint is achieved almost entirely by the triceps brachii but extension of the arm, which actually takes place at the shoulder joint, is achieved by muscles on the back, such as the latissimus dorsi.
THE ARM CONSIST OF THE DELTOID, TRICEPS (BACK OF ARM) BICEPS(FRONT OF ARM) AND THEN EXTENSORS( THE MUSCLE GOING UP FROM YOUR THUMB) AND FLEXORS(GOING UP FROM YOUR PINKY) THE LEG IS QUADRICEP CONSISTING OF FOUR MUSCLE GROUPS : * Rectus femoris * Vastus lateralis * Vastus medialis * Vastus intermedius you can find out more from www.bodyteen.com
Quadracep muscles: vastus lateralis, vastus medialis, vastus intermedialis, sartorius Non-quads: Biceps femoris
Hamstrings ( Biceps Femoris, Semitendinosus & Semimembranosus) are the Agonistic Muscles Quadricpes ( Rectus Femoris, Vastus Lateralis, Vastus Medialis & Vastus Intermedius) are the Antagonistic Muscles Hope I Helped... Sharnie x :)
Muscles that flex the knee are the hamstrings which include your semitendinosus, semimembranosus and biceps femoris musces. Muscles that extend the knee are the quadriceps muscles which includes your vastus lateralis obliques, vastus intermedius, vastus medialis obliques and your rectus femoris.