The muscle that has the major responsibility for producing the opposite movement of a specific movement is the:
Prime mover
Synergist
Agonist
Antagonist
Fixator
The Correct Answer is D
Choice A reason: The prime mover, or agonist, is the muscle primarily responsible for producing a specific movement, not its opposite.
Choice B reason: A synergist assists the prime mover by adding force or reducing unnecessary movement. It does not produce the opposite action.
Choice C reason: Agonist is another term for prime mover. It initiates the movement, not the opposing one.
Choice D reason: Antagonist is the correct answer. It is the muscle that opposes the action of the agonist. For example, the triceps brachii is the antagonist to the biceps brachii during elbow flexion.
Choice E reason: A fixator stabilizes the origin of the prime mover so that it can act more efficiently. It does not produce opposing movement.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
Choice A reason: The talus is a tarsal bone in the ankle that articulates with the tibia and fibula. It is not embedded within a tendon and therefore not classified as a sesamoid bone.
Choice B reason: The radius is a long bone in the forearm and is not embedded in a tendon. It does not meet the criteria for a sesamoid bone.
Choice C reason: The femur is the longest bone in the body and is classified as a long bone. It is not a sesamoid bone.
Choice D reason: The hamate is one of the carpal bones in the wrist. It is not embedded in a tendon and is not considered a sesamoid bone.
Choice E reason: The patella is the most prominent example of a sesamoid bone. It is embedded within the quadriceps tendon and functions to protect the knee joint and enhance leverage during leg extension.
Correct Answer is E
Explanation
Choice A reason: While coordination is important in highly mobile joints, this is not the primary reason for the vulnerability of the glenohumeral joint.
Choice B reason: Ligaments around the shoulder joint are indeed more flexible to allow movement, but this alone does not fully explain the joint’s instability.
Choice C reason: Power generation is not significantly reduced due to mobility. Muscles around the shoulder can generate substantial force.
Choice D reason: Blood vessels are generally well protected and not easily compromised by joint movement. This is not a common consequence of shoulder mobility.
Choice E reason: This is the correct answer. The glenohumeral joint is a ball-and-socket joint with a shallow socket, allowing extensive range of motion. However, this anatomical configuration makes it relatively unstable and prone to dislocation, especially during forceful or awkward movements.
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