Q:

What muscles are antagonistic pairs?

A:

The BBC says that the biceps and triceps are antagonistic muscle pairs. Muscles can pull, but they cannot push. If there was only one muscle, then the limb wouldn't be able to get back into its original position. Antogonist muscle pairs are necessary for proper movement.

The forearm is controlled by the biceps and triceps contractions. The BBC explains that the forearm moves downs when the triceps contract, and it moves up when the biceps contract. The movements succeed when the muscles get shorter.

Another example of an antagonistic muscle pair is the quadriceps and hamstrings. The BBC says that these muscles are responsible for extending and contracting the knee. The quadriceps contract to pull the lower leg forward, and the hamstrings contract to pull the lower leg backwards. The motion allows the leg to swing back and forth. The pair allows the arm to lift objects and put them down.

According to Aworkouts.com, the back and chest muscles are antagonistic muscle pairs. The back helps the body perform pull-ups, while the chest allows the body to do push-ups. The lower back and the abdominal muscles act as antagonistic muscle pairs as well. The abs contract forward when bending over, and the lower back contracts to pull the body upright.

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Related Questions

  • Q:

    Why are muscles arranged in pairs?

    A:

    Muscles are arranged in pairs on the skeleton in order to allow extension and contraction of body parts. According to the BBC, skeletal muscles can only pull in one direction.

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  • Q:

    How do pairs of skeletal muscles work together?

    A:

    According to the University of the Western Cape, skeletal muscles work in pairs so that they can alternately pull on a bone to achieve movement. In other words, when a human wants to bend his elbow, he must relax his triceps muscle, while contracting his biceps. Such muscle groups are called antagonistic muscles, because they pull in opposite directions.

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  • Q:

    Where are your biceps?

    A:

    According to WebMD, the biceps muscle is located at the frontal part of the upper arms. This muscle is composed of a "long head" and a "short head," which work together as a single muscle.

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  • Q:

    What is an antagonistic muscle in the leg?

    A:

    According to the BBC, antagonistic muscles are pairs of muscles that work by alternately contracting and relaxing. In the human leg, the quadriceps and hamstrings are one example of antagonistic muscles. As York College explains, skeletal muscles always work in groups and never work in isolation.

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