Synarthrotic joints __________.
Can be dislocated easily
Are freely movable
Are slightly movable
Are immovable
The Correct Answer is D
Choice A reason: Synarthrotic joints are structurally designed to be immobile, often found in areas like the skull where bones are tightly joined by fibrous tissue. Because of their rigidity and lack of movement, they are not prone to dislocation.
Choice B reason: Freely movable joints are classified as diarthroses, such as the shoulder or knee. Synarthrotic joints are the opposite, offering no movement between the bones.
Choice C reason: Slightly movable joints are called amphiarthroses, such as the joints between vertebrae. Synarthrotic joints do not allow even slight movement.
Choice D reason: Synarthrotic joints are immovable joints where bones are connected by fibrous tissue or cartilage. Examples include sutures in the skull. Their primary function is protection and structural stability.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
Choice A reason: Circumduction is a circular movement that combines flexion, extension, abduction, and adduction. It is typically seen in ball-and-socket joints like the shoulder or hip, not in the neck. It does not describe the backward bending of the head.
Choice B reason: Rotation refers to the movement of a bone around its longitudinal axis, such as turning the head side to side. It does not involve bending the head backward.
Choice C reason: Hyperextension occurs when a joint is extended beyond its normal anatomical position. In the case of the head, bending it backward past the neutral anatomical position is a classic example of hyperextension.
Choice D reason: Flexion is the movement that decreases the angle between two body parts, such as bending the head forward toward the chest. It is the opposite of the movement described in the question.
Correct Answer is D
Explanation
Choice A reason: Irregular bones have complex shapes and serve various functions, such as protection and muscle attachment, but they are not specialized for weight-bearing or resistance to twisting.
Choice B reason: Trabecular bone, also known as spongy bone, is lightweight and porous. It helps absorb shock and supports bone marrow but is not optimized for resisting twisting stresses.
Choice C reason: Interstitial bone refers to remnants of old osteons found between newer ones in compact bone. It is not a distinct tissue type adapted for mechanical stress.
Choice D reason: Compact bone is the correct answer. It is dense and organized into osteons, which provide strength and resistance to compressive and torsional forces. It forms the outer layer of bones and is especially prominent in the diaphysis of long bones.
Choice E reason: Spongy bone is adapted for shock absorption and lightness but lacks the dense structure needed to resist twisting and heavy loads.
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