Muscles of the Head, Neck and Trunk Muscles can be classified according to their

Question

Muscles of the Head, Neck and Trunk Muscles can be classified according to their functions. An agonist, or prime mover, is a muscle that directly brings about a specific action. For example, the biceps brachii is an agonist for flexion of the forearm. Muscles can also act as synergists ('working together) by promoting or assisting a specific action or by reducing unnecessary movements while the action is performed. The brachioradialis flexes the forearm An antagonist muscle directly opposes a specific action. The triceps brachii extends the forearm and is an antagonist muscle that opposes flexion. and stabilizes the elbow joint. For which muscle, the biceps brachii or the triceps brachii, does the brachioradialis act as a synergist? Explain. If extension of the forearm is the action that you are considering the roles of the biceps brachil and triceps brachil are reversed Explain why. Levator scapulaescapulae, rhomboids, and serratus anterior ser MAKING CONNECTIONS When the triceps brachii extends the arm, the

Explanation / Answer

Ans3- during extension of forearm triceps brachii has primary role and as bicep brachii is its antagonist both of their functions are reversed

bicep brachii helps in flexing forearm

Ans 4--Brachialis

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