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 E
Explanation
Choice A reason: Central lamellae is not a recognized anatomical term. The central canal, however, is part of an osteon and contains blood vessels and nerves. It does not refer to lamellae between osteons.
Choice B reason: Concentric lamellae are rings of bone matrix that surround the central canal within an osteon. They are integral to the osteon structure and not found between osteons.
Choice C reason: Circumferential lamellae are located around the outer and inner surfaces of compact bone, encircling the entire bone structure. They are not found between osteons.
Choice D reason: Perforating canals, or Volkmann’s canals, run perpendicular to the central canals and connect them to the periosteum and medullary cavity. They are not lamellae and do not lie between osteons.
Choice E reason: Interstitial lamellae are remnants of old osteons that have been partially resorbed during bone remodeling. They fill the spaces between current osteons and are not part of any single osteon, making them the correct answer.
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 one of the two long bones in the forearm. It is not a sesamoid bone, as it is not formed within a tendon.
Choice C reason: The femur is the longest and strongest bone in the body, located in the thigh. It is a long bone, not a sesamoid bone.
Choice D reason: The hamate is a carpal bone in the wrist. It is not embedded in a tendon and thus not a sesamoid bone.
Choice E reason: The patella, or kneecap, is the most well-known example of a sesamoid bone. It is embedded within the quadriceps tendon and functions to protect the knee joint and improve leverage during leg extension.
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