The joint between the radius and ulna is a joint:
hinge
pivot
plane or gliding
saddle
ball-and-socket
The Correct Answer is B
Choice A reason: Hinge joints allow movement in one plane, such as flexion and extension. Examples include the elbow and knee, but the joint between the radius and ulna does not function this way.
Choice B reason: This is correct. The proximal radioulnar joint is a pivot joint, allowing rotational movement such as pronation and supination of the forearm. The radius rotates around the ulna, enabling the palm to turn up or down.
Choice C reason: Plane or gliding joints allow sliding movements between flat surfaces, such as those between carpal bones. This does not apply to the radius and ulna.
Choice D reason: Saddle joints allow movement in two planes and are found in the thumb (carpometacarpal joint). The radius and ulna do not form a saddle joint.
Choice E reason: Ball-and-socket joints allow movement in multiple directions and are found in the shoulder and hip. The radius and ulna do not form this type of joint.
Nursing Test Bank
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: Tendons attach muscles to bones, not to articular cartilage. Cartilage does not serve as an attachment site for tendons.
Choice B reason: Red blood cells are produced in the red bone marrow, which is found in spongy bone, not in articular cartilage.
Choice C reason: Articular cartilage is composed of hyaline cartilage and covers the ends of bones in synovial joints. It provides a smooth, lubricated surface for articulation and acts as a cushion to absorb compressive forces during movement.
Choice D reason: Bone length increases through growth at the epiphyseal plate, not through articular cartilage.
Choice E reason: The synovial membrane lines the joint capsule and produces synovial fluid. It is a separate structure from articular cartilage.
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