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antagonist

antagonist

7.7
A muscle that relaxes while another muscle tightens to move a body part
  • noun
  • /ænˈtæɡənɪst/
  • Specialized
translation icon : músculo antagonista
  • This FNS-KE exercise system provides smooth contractions of the quadriceps muscles, and there is no apparent need for co-contraction of antagonist muscles.

Examples

  • So with coordinated muscle and action, we have this beautifully timed process where one muscle contracts and the antagonist or yoked muscle relaxers.

  • When one muscle contracts, its antagonist muscle relaxes to allow smooth movement during exercise.

  • Ondansetron is a 5-HT3 receptor antagonist used for the prevention of nausea and vomiting in patients receiving chemotherapy or radiation therapy.

    Academic text (2007)
  • The first clinical fitting (to our knowledge) of a powered hand prosthesis, controlled directly by antagonist muscles (via exteriorized tendons) in a physiological manner, was accomplished.

    Academic text (2001)
  • In the human body, the biceps and triceps work together, where the triceps serve as the antagonist to the biceps during arm extension.

  • During flexion of the forearm, the biceps contracts while its antagonist, the triceps, relaxes to allow the motion.

Synonyms

antagonistic muscle
vsantagonist
  • Specialized
6.3

A muscle that works against another to control movement at a joint

relaxes while the other contracts rather than actively controlling movement

Antonyms

agonist
  • Specialized
8.1

A muscle that tightens to make a movement while the opposite muscle relaxes

Compounds

estrogen antagonist
  • Specialized
6.7

A medicine that stops estrogen from working used to treat some breast cancers

narcotic antagonist
  • Specialized
6.1

A drug that stops the effects of strong pain medicines and helps breathing

strong antagonist
  • Literature
5.1

A powerful character who opposes the hero and creates major conflict

ultimate antagonist
  • Literature
7.9

The main enemy at the end of a story who the heroes must defeat

Surface Forms

antagonist singular
antagonists plural

Morphology

antagonist = agonist (opaque) = anti + agonist

The form is analyzable as anti- plus agonist, but the physiological meaning requires technical knowledge and is not transparent to most learners.

Etymology

Antagonist comes from the Greek parts anti- 'against' and agon 'contest'. In the body an antagonist muscle works 'against' another muscle by relaxing when the other pulls, so it opposes the movement.