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 B
Explanation
Choice A reason: Hinge joints allow movement in one plane, such as flexion and extension, seen in the elbow and knee. They do not permit gliding motions.
Choice B reason: Plane joints are the correct answer. They allow bones to slide past each other in any direction along the plane of the joint. The carpal bones in the wrist articulate via plane joints, enabling gliding movements.
Choice C reason: Ball-and-socket joints allow multi-directional movement and rotation, such as in the shoulder and hip. They are not involved in the gliding motion of carpal bones.
Choice D reason: Condyloid joints permit movement in two planes, such as flexion/extension and abduction/adduction. They are found in the wrist but not between carpal bones.
Choice E reason: Pivot joints allow rotational movement around a single axis, such as the joint between the atlas and axis vertebrae. They do not facilitate gliding.
Correct Answer is D
Explanation
Choice A reason: Perforating canals (also known as Volkmann's canals) connect the central canals of different osteons and allow blood vessels and nerves to travel across bone. While they contribute to nutrient transport, they do not directly facilitate exchange between osteocytes.
Choice B reason: Lamellae are concentric rings of bone matrix within osteons. They provide structural support but do not directly mediate nutrient or waste exchange between osteocytes.
Choice C reason: Central canals (Haversian canals) contain blood vessels and nerves and run longitudinally through osteons. They help deliver nutrients to the bone but do not directly connect individual osteocytes.
Choice D reason: Canaliculi are microscopic channels that connect osteocytes within lacunae to each other and to the central canal. These channels allow for the direct exchange of nutrients and waste products between osteocytes, making them the most direct structure for this function.
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