Ossification of the ends of long bones:
Takes twice as long as the ossification of the shaft
Is a characteristic of intramembranous bone formation
Involves secondary ossification centers
Occurs before the formation of the diaphysis
The Correct Answer is C
Choice A reason: Ossification of the ends of long bones (epiphyses) does not necessarily take twice as long as the shaft (diaphysis). The timing varies depending on the bone and developmental stage. The shaft begins ossifying earlier via the primary ossification center, typically during fetal development, while the ends ossify later via secondary centers, often after birth. However, the duration is not uniformly double.
Choice B reason: Intramembranous ossification is responsible for forming flat bones such as the skull and clavicle. The ends of long bones undergo endochondral ossification, not intramembranous. Therefore, this choice incorrectly associates the process with the wrong ossification type.
Choice C reason: The ends of long bones ossify through secondary ossification centers, which appear after birth. These centers are responsible for forming the epiphyses and are distinct from the primary ossification centers in the shaft. This is the correct and scientifically supported answer.
Choice D reason: Ossification of the diaphysis (shaft) begins earlier than the epiphyses. The primary ossification center in the shaft typically appears during fetal development, while secondary centers in the ends appear postnatally. Thus, this statement is factually incorrect.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
Choice A reason: Myofilaments are microscopic protein filaments (actin and myosin) within myofibrils. They are not bundles of muscle fibers but rather the smallest contractile units.
Choice B reason: Fascicle is the correct term for a bundle of muscle fibers. Each fascicle is surrounded by perimysium and contains multiple muscle cells, making it the appropriate anatomical structure.
Choice C reason: Myofibrils are intracellular structures within muscle cells that contain myofilaments. They are not bundles of muscle fibers but rather components of individual muscle cells.
Choice D reason: Whole muscle refers to the entire organ composed of multiple fascicles, connective tissues, blood vessels, and nerves. It is a larger structure than a bundle of muscle fibers.
Choice E reason: Muscle cell, also known as a muscle fiber, is a single cell within a fascicle. It is not a bundle but an individual unit.
Correct Answer is C
Explanation
Choice A reason: Abduction is the movement of a limb away from the midline of the body, which increases the angle between the limb and the trunk.
Choice B reason: Flexion decreases the angle between two bones, such as bending the elbow or knee.
Choice C reason: Rotation involves turning a bone around its longitudinal axis, such as turning the head side to side. It does not change the angle between bones, making it the correct answer.
Choice D reason: Adduction is the movement of a limb toward the midline of the body, decreasing the angle between the limb and the trunk.
Choice E reason: Circumduction is a circular movement that combines flexion, extension, abduction, and adduction. It involves changes in angles between bones throughout the motion.
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