What is the primary function of articular cartilage in synovial joints?
To produce synovial fluid
To connect bones
To absorb shock and reduce friction
To facilitate nerve signaling
The Correct Answer is C
A. To produce synovial fluid: Synovial fluid is produced by the synovial membrane (lining of the joint capsule), not by the articular cartilage.
B. To connect bones: Structural connections between bones are provided by ligaments rather than articular cartilage.
C. To absorb shock and reduce friction: Articular cartilage provides a smooth, resilient surface that distributes load and reduces friction between joint surfaces during movement.
D. To facilitate nerve signaling: Articular cartilage is avascular and largely aneural, so it does not play a direct role in nerve signaling.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
A. Iron:Iron is essential for hemoglobin and oxygen transport, not a primary structural bone mineral.
B. Sodium: Sodium is an extracellular electrolyte important for fluid balance and nerve function, not bone hardness.
C. Potassium: Potassium is an intracellular electrolyte important for cell function, not the main bone mineral.
D. Calcium: Calcium (along with phosphate in hydroxyapatite) is the primary mineral that gives bone its hardness and compressive strength.
Correct Answer is C
Explanation
A. Muscle atrophy:Muscle atrophy is loss of muscle mass seen in disuse or neuromuscular disease rather than a hallmark of fibromyalgia.
B. Localized joint inflammation:Localized joint inflammation suggests inflammatory arthritis, which differs from fibromyalgia’s noninflammatory pain.
C. Widespread musculoskeletal pain:Widespread musculoskeletal pain, often accompanied by fatigue and sleep disturbance, is a defining feature of fibromyalgia.
D. Skin rashes:Skin rashes are not a typical symptom of fibromyalgia and point toward dermatologic or systemic inflammatory conditions.
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