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Questions and Answers
Which type of muscle is primarily responsible for generating a specific movement?
Which type of muscle is primarily responsible for generating a specific movement?
- Agonist (correct)
- Synergist
- Fixator
- Antagonist
An antagonist muscle assists the agonist by contributing tension at the agonist's mobile attachment point.
An antagonist muscle assists the agonist by contributing tension at the agonist's mobile attachment point.
False (B)
What is the role of an antagonist muscle in relation to an agonist muscle?
What is the role of an antagonist muscle in relation to an agonist muscle?
oppose the action
A muscle that stabilizes the origin of an agonist is called a(n) _______.
A muscle that stabilizes the origin of an agonist is called a(n) _______.
Match the muscle type with its function:
Match the muscle type with its function:
When the triceps brachii extends the forearm, which muscle acts as the antagonist?
When the triceps brachii extends the forearm, which muscle acts as the antagonist?
Synergists are most useful at the end of a movement when the agonist can exert maximum power.
Synergists are most useful at the end of a movement when the agonist can exert maximum power.
Which of the following describes the role of synergists?
Which of the following describes the role of synergists?
Provide an example of two synergistic muscles that work together to flex the elbow joint.
Provide an example of two synergistic muscles that work together to flex the elbow joint.
What is the primary function of adjusting tension in a stretched muscle during movement?
What is the primary function of adjusting tension in a stretched muscle during movement?
Flashcards
Agonist
Agonist
A muscle that contracts to produce a particular movement.
Antagonist
Antagonist
A muscle whose actions oppose those of the agonist; produces the opposite movement.
Synergist
Synergist
A muscle that assists the agonist in performing its action; may stabilize a joint.
Fixators
Fixators
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Study Notes
- Skeletal muscles collaborate to produce movements and are grouped by primary action.
Agonist
- An agonist, or prime mover, contracts to create a specific movement.
- The triceps brachii muscle extends the forearm.
Antagonist
- Antagonists' actions oppose those of the agonist.
- If the agonist extends, the antagonist flexes.
- Antagonist contraction stretches the agonist, and vice versa.
- Tension in the stretched muscle manages movement speed and smoothness
- When the triceps brachii extends the forearm, the biceps brachii acts as an antagonist to stabilize the movement and produce the opposing action, which is flexion of the forearm.
Synergist
- Synergists aid agonists in performing actions by contributing tension near the muscle's more mobile attachment, or stabilizing the muscle's less mobile attachment.
- Synergists are most useful when the agonist is lengthened and lacks power.
- The biceps brachii and the brachialis muscles work together to flex the elbow joint.
- Synergists can stabilize the origin of the agonist, acting as fixators.
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