In a patient with osteoporosis, which type of bone cell activity is likely increased, leading to bone density loss?
Chondrocytes
Fibroblasts
Osteoblasts
Osteoclasts
Correct answer: D
The Correct Answer is D
A. Chondrocytes: Chondrocytes maintain cartilage and are not the principal cells responsible for bone resorption in osteoporosis.
B. Fibroblasts: Fibroblasts synthesize connective tissue matrix and are not the main drivers of bone density loss.
C. Osteoblasts: Osteoblasts form new bone, and reduced rather than increased osteoblastic activity contributes to osteoporosis when bone formation lags behind resorption.
D. Osteoclasts: Osteoclasts resorb bone matrix, and increased osteoclastic activity relative to formation leads to net bone loss seen in osteoporosis.
Nursing Test Bank
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Related Questions
Correct Answer is A
Explanation
A. To bind to troponin, allowing cross-bridge formation:Calcium ions bind to troponin, causing a conformational change that exposes myosin-binding sites on actin and permits cross-bridge cycling.
B. To stimulate the release of acetylcholine:Calcium influx into the presynaptic nerve terminal triggers acetylcholine release, but the primary role of calcium in muscle contraction is within the muscle fiber at troponin.
C. To provide energy for muscle contraction:Energy for contraction is supplied by ATP, not by calcium ions.
D. To transport oxygen to muscle cells:Oxygen transport is the role of hemoglobin and myoglobin, not calcium ions.
Correct Answer is D
Explanation
A. Ligaments:Ligaments stabilize and limit joint movement but do not primarily reduce friction.
B. Articular cartilage: Articular cartilage provides a smooth, low-friction surface and shock absorption, helping reduce friction.
C. Joint capsule: The joint capsule encloses and stabilizes the joint and contains synovial fluid but is not the main friction-reducing element.
D. Synovial fluid: Synovial fluid lubricates the joint surfaces, nourishes cartilage, and significantly reduces friction during movement.
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