Which movement describes turning or rotating movement at a single axis?

Which movement describes turning or rotating movement at a single axis?

• A. Circumduction
• B. Rotation
• C. Adduction
• D. Abduction

Answer: (B)

Rotation is a turning movement around a single axis. It happens when a body part spins about a fixed line, like turning your head from side to side along a vertical axis or rotating the forearm so the palm faces up or down along its own long axis. Circumduction, by contrast, describes moving the limb in a circular path that combines several movements (flexion, extension, abduction, and adduction) and travels around multiple axes, forming a cone. Adduction and abduction are movements toward or away from the midline in a plane, not a spin around an axis. So the defining idea here is rotation—turning around one axis.

Rotation is a turning movement around a single axis. It happens when a body part spins about a fixed line, like turning your head from side to side along a vertical axis or rotating the forearm so the palm faces up or down along its own long axis. Circumduction, by contrast, describes moving the limb in a circular path that combines several movements (flexion, extension, abduction, and adduction) and travels around multiple axes, forming a cone. Adduction and abduction are movements toward or away from the midline in a plane, not a spin around an axis. So the defining idea here is rotation—turning around one axis.