A fracture in the shaft of a bone would be a break in the:
Metaphysis
Epiphysis
Diaphysis
Periosteum
Endosteum
The Correct Answer is C
Choice A reason: The metaphysis is the region between the diaphysis and epiphysis, often containing the growth plate in children. It is not the shaft of the bone.
Choice B reason: The epiphysis refers to the ends of long bones, which articulate with adjacent bones. A fracture here would not be considered a shaft fracture.
Choice C reason: The diaphysis is the correct answer. It is the central shaft of a long bone, composed primarily of compact bone and housing the medullary cavity. Fractures in this region are common in long bones like the femur and humerus.
Choice D reason: The periosteum is a fibrous membrane covering the outer surface of bones. While it may be affected in a fracture, it is not the structural region referred to as the shaft.
Choice E reason: The endosteum lines the inner surface of the bone, including the medullary cavity. It plays a role in bone remodeling but is not the shaft itself
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
Choice A reason: Bone remodeling after an injury is part of the healing process but is not synonymous with ossification. Remodeling involves both bone resorption and formation but is a later stage in bone repair.
Choice B reason: Making a cartilage model of the fetal bone refers to endochondral ossification’s early stage, but ossification itself is the process of converting that cartilage into bone.
Choice C reason: Bone destruction to release calcium is known as bone resorption, primarily carried out by osteoclasts. It is not the same as ossification.
Choice D reason: Bone formation is the correct answer. Ossification is the process by which new bone is formed, either by replacing cartilage (endochondral ossification) or forming directly from mesenchymal tissue (intramembranous ossification).
Choice E reason: Making collagen fibers for calcified cartilage is a component of cartilage development but does not define ossification. Ossification involves mineralization and the transformation of cartilage or mesenchyme into bone.
Correct Answer is C
Explanation
Choice A reason: Muscle relaxation is primarily governed by the removal of calcium ions from the sarcoplasm and the cessation of neural stimulation. Wave summation, on the other hand, is a mechanism that enhances contraction, not relaxation.
Choice B reason: While wave summation can contribute to sustained contractions, it does not directly prevent fatigue. In fact, repeated summation without rest can lead to fatigue due to depletion of energy stores and accumulation of metabolic byproducts.
Choice C reason: Wave summation increases the force of muscle contraction by layering successive stimuli before the muscle has fully relaxed. This results in a stronger, more sustained contraction due to residual calcium and continued cross-bridge cycling. It is a key physiological mechanism for producing smooth and powerful movements.
Choice D reason: Calcium ion release is essential for initiating muscle contraction. Wave summation does not reduce calcium release; rather, it builds on residual calcium from previous stimuli to enhance contraction force.
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