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  • Simple diagram of Skeletal arm with triceps and biceps muscles
    Rights: The University of Waikato Te Whare Wānanga o Waikato Published 21 June 2007 Size: 21 KB Referencing Hub media

    Groups of muscles work together, for example when the biceps muscle contracts to flex (bend) the forearm, the triceps muscle relaxes. To extend (straighten) the forearm the biceps relaxes and the triceps contracts.

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