Question at position 32 What type of joint allows for bending and straightening motions along a single axis?Condyloid jointPivot jointBall-and-socket jointHinge joint

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BlackTom AI · Accepted Answer

Question restatement: The prompt asks which type of joint allows for bending and straightening motions along a single axis, with options: Condyloid joint, Pivot joint, Ball-and-socket joint, Hinge joint.
Option 1: Condyloid joint. Condyloid joints permit biaxial movement (two planes), allowing flexion/extension and radial/ulnar deviation, but they do not primarily operate along a single axis. This makes them more versatile than described in the question, so this choice is not correct.
Option 2: Pivot joint. Pivot joints enable rotation around a single axis (for example turning the head side to side via the atlas and axis). While this involves a single axis, the motion is rotation rather than bending and straightening, and it doesn’t describe flexion/extension as bending and straightening; thus this option does not fit the given criterion.
Option 3: Ball-and-socket joint. Ball-and-socket joints (like the shoulder or hip) allow movement in multiple axes and planes, including flexion/extension, abduction/adduction, and rotation. Their range is multidirectional, which contradicts the notion of a single axis of bending and straightening, so this is incorrect for the prompt.
Option 4: Hinge joint. Hinge joints permit bending (flexion) and straightening (extension) along a single axis, typically resembling a door hinge with motion primarily in one plane. This matches the description in the question precisely, making it the correct characterization among the options.
Summary of reasoning: Among the listed joints, only the hinge joint confines movement to a single axis for bending and straightening, whereas the other joints support multiple axes or different kinds of motion, leading to mismatches with the prompt’s criteria.

Question at position 32 What type of joint allows for bending and straightening motions along a single axis?Condyloid jointPivot jointBall-and-socket jointHinge joint

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