The central canal that runs through the core of each osteon contains:
Blood vessels and nerve fibers
Adipose tissue and nerve fibers
Yellow marrow and spicules
Cartilage and interstitial lamellae
Red marrow and nerves
The Correct Answer is A
Choice A reason: The central canal, also known as the Haversian canal, is located at the center of each osteon in compact bone. It contains blood vessels and nerve fibers that supply nutrients and signals to the bone cells.
Choice B reason: Adipose tissue is found in yellow marrow, primarily in the medullary cavity of long bones, not in the central canal of osteons.
Choice C reason: Yellow marrow and spicules are found in the medullary cavity and spongy bone, respectively. They are not components of the central canal.
Choice D reason: Cartilage is not present in the central canal. Interstitial lamellae are layers of bone matrix found between osteons, not within the canal.
Choice E reason: Red marrow is found in spongy bone and certain flat bones, not in the central canal. While nerves are present, the absence of blood vessels in this choice makes it incomplete.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
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.
Correct Answer is E
Explanation
Choice A reason: The platysma is a superficial neck muscle involved in depressing the mandible and tensing the skin of the neck. It is not associated with facial expressions like smiling.
Choice B reason: The masseter is a powerful jaw muscle responsible for chewing. It does not contribute to smiling or ceremonial expressions.
Choice C reason: The sternocleidomastoid is a neck muscle involved in head rotation and flexion. It is not used in facial expressions.
Choice D reason: The orbicularis oris encircles the mouth and is responsible for movements like puckering or closing the lips. While it may be involved in kissing, it is not the primary muscle used for smiling.
Choice E reason: The zygomaticus muscle, specifically the zygomaticus major, elevates the corners of the mouth and is the primary muscle used in smiling. It is commonly activated during joyful expressions, such as those seen in wedding ceremonies.
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