Circular movement around an axis.

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Multiple Choice

Circular movement around an axis.

Rotation is circular movement around an axis. When a body part turns about a fixed line, like turning the head side to side around a vertical axis or twisting the forearm along its long axis (pronation and supination), the motion is rotation. Translation would move a segment in a straight path without spinning around an axis, so it’s not circular around an axis. Flexion decreases a joint angle, such as bending the elbow; protraction is a forward movement in a plane, like jutting the jaw forward. Neither of those involves turning around an axis. So the description fits rotation.

Rotation is circular movement around an axis. When a body part turns about a fixed line, like turning the head side to side around a vertical axis or twisting the forearm along its long axis (pronation and supination), the motion is rotation. Translation would move a segment in a straight path without spinning around an axis, so it’s not circular around an axis. Flexion decreases a joint angle, such as bending the elbow; protraction is a forward movement in a plane, like jutting the jaw forward. Neither of those involves turning around an axis. So the description fits rotation.

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