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Support for P4 BTEC National - Sport Unit 1: Principles of Anatomy and Physiology in Sport Activity 11 – Antagonistic pairs; muscles working together One of the muscles’ main functions is to produce movement – which they do through a series of contractions and relaxation. Some of the key information you need to introduce this function can be found below….so read on! Muscles are arranged in antagonistic pairs. As one muscle contracts (shortens) its partner relaxes (lengthens). They swap actions to reverse the movement. The biceps and triceps work together as an antagonistic pair to move the elbow joint. To flex the elbow, the biceps (agonist) contracts and the triceps (antagonist) relaxes. To extend the elbow, the actions are reversed so that the triceps contracts (agonist) and the biceps relaxes (antagonist). The muscle group that holds the joint still is called the fixator. Support for P4 Is there another example in the body that work together to create movement? _____________________________________________________________ When the triceps relaxes what are the biceps doing? _____________________________________________________________ What does the term ‘antagonistic pair’ mean? _____________________________________________________________ Describe the muscles in action below and describe how those muscles are working together to move: __________________________________ __________________________________ __________________________________ __________________________________ __________________________________ __________________________________ __________________________________ _______________________________ _______________________________ _______________________________ _______________________________ _______________________________ _______________________________ _______________________________ _______________________________ _______________________________ There we go….a short ‘n’ sweet introduction – but all good stuff!