In the classification of joints, which of the following is TRUE?
Synarthrotic joints are slightly movable.
All synovial joints are freely movable.
A gomphosis is a freely movable joint.
In cartilaginous joints, a joint cavity is present.
Immovable joints are called amphiarthroses.
The Correct Answer is B
Choice A reason: Synarthrotic joints are immovable, not slightly movable. Examples include sutures in the skull. They are designed for stability rather than movement.
Choice B reason: Synovial joints are the only type of joint that is always freely movable. They include hinge joints (e.g., elbow), ball-and-socket joints (e.g., shoulder), and others that allow a wide range of motion due to the presence of a synovial cavity and lubricating fluid.
Choice C reason: A gomphosis is a type of fibrous joint found between teeth and their sockets. It is immovable and not freely movable.
Choice D reason: Cartilaginous joints do not have a joint cavity. They are connected entirely by cartilage and allow limited movement, such as the intervertebral discs and the pubic symphysis.
Choice E reason: Immovable joints are called synarthroses, not amphiarthroses. Amphiarthroses are slightly movable joints, such as those between vertebrae.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
Choice A reason: Cross bridges are formed between actin and myosin during contraction. T tubules do not hold them in place; their role is electrical, not structural.
Choice B reason: While T tubules are embedded in the muscle fiber, their function is not to provide structural support. That role is fulfilled by connective tissues like endomysium and cytoskeletal proteins.
Choice C reason: G and F actin are stabilized by proteins like tropomyosin and nebulin, not T tubules. T tubules are involved in electrical signaling.
Choice D reason: This is the correct answer. T tubules are invaginations of the sarcolemma that conduct action potentials deep into the muscle fiber. This ensures that the signal for contraction reaches all parts of the muscle simultaneously, triggering calcium release from the sarcoplasmic reticulum.
Choice E reason: Glucose synthesis occurs in the liver and other tissues via gluconeogenesis. Muscle cells use glucose for energy but do not synthesize it through T tubules.
Correct Answer is B
Explanation
Choice A reason: Dense fibrous connective tissue forms tendons and ligaments, not the precursor to long bones. It lacks the structural and biochemical properties necessary for endochondral ossification.
Choice B reason: Hyaline cartilage serves as the template for long bone formation during embryonic development. Through endochondral ossification, this cartilage is gradually replaced by bone tissue, making it the correct answer.
Choice C reason: Mesenchymal tissue is the embryonic connective tissue from which various structures, including cartilage and bone, originate. However, it is not the immediate precursor to long bones; it first differentiates into chondrocytes that form hyaline cartilage.
Choice D reason: Elastic cartilage is found in structures like the ear and epiglottis. It is not involved in the formation of long bones and lacks the rigidity and mineralization capacity required for ossification.
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