Which term describes turning movement around a single axis?

Which term describes turning movement around a single axis?

• A. Rotation
• B. Circumduction
• C. Flexion
• D. Extension

Answer: (A)

Turning movement around a single axis is rotation. It happens when a bone or body part spins around a fixed line, like the head turning from side to side or the forearm rotating to pronate or supinate. This is different from circumduction, which moves a limb in a circular path by combining several motions in different planes, not a twist around one axis. Flexion and extension involve bending and straightening at a joint, changing the angle between bones rather than spinning around an axis.

Turning movement around a single axis is rotation. It happens when a bone or body part spins around a fixed line, like the head turning from side to side or the forearm rotating to pronate or supinate. This is different from circumduction, which moves a limb in a circular path by combining several motions in different planes, not a twist around one axis. Flexion and extension involve bending and straightening at a joint, changing the angle between bones rather than spinning around an axis.