Position and mass of muscles prevent joints from which action?

Position and mass of muscles prevent joints from which action?

• A. Extending
• B. Rotating
• C. Stabilizing
• D. Flexing

Answer: (D)

The stay apparatus works by arranging the limb muscles and their attachments so that, when the animal bears weight, the extensor tendons and supporting ligaments pull the joints into an extended, locked position. This tension resists bending, meaning the joints are prevented from flexing. In other words, the position and bulk of these muscles act to keep the limb straight and support standing with little muscular effort. Rotation and general stabilization aren’t the primary constraints here—the key outcome is preventing flexion by maintaining extension.

The stay apparatus works by arranging the limb muscles and their attachments so that, when the animal bears weight, the extensor tendons and supporting ligaments pull the joints into an extended, locked position. This tension resists bending, meaning the joints are prevented from flexing. In other words, the position and bulk of these muscles act to keep the limb straight and support standing with little muscular effort. Rotation and general stabilization aren’t the primary constraints here—the key outcome is preventing flexion by maintaining extension.