Sagittal: straightening of joints, increases relative angle.

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Multiple Choice

Sagittal: straightening of joints, increases relative angle.

Explanation:
Extension is the movement that straightens a joint and increases the angle between the two bones. When a joint extends, you move from bent toward straight, opening up more space between the bones. Flexion does the opposite by bending the joint and reducing that angle. At the ankle, dorsiflexion and plantarflexion are specific sagittal-plane motions (dorsiflexion brings the top of the foot toward the shin, plantarflexion points the toes downward), but the general definition given—straightening to increase the angle—describes extension.

Extension is the movement that straightens a joint and increases the angle between the two bones. When a joint extends, you move from bent toward straight, opening up more space between the bones. Flexion does the opposite by bending the joint and reducing that angle. At the ankle, dorsiflexion and plantarflexion are specific sagittal-plane motions (dorsiflexion brings the top of the foot toward the shin, plantarflexion points the toes downward), but the general definition given—straightening to increase the angle—describes extension.

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