Which sequence describes an open chain condition where the limb is off the ground?

Which sequence describes an open chain condition where the limb is off the ground?

• A. Open Chain
• B. Closed Chain
• C. Isometric
• D. Concentric

Answer: (A)

Open chain movement means the limb is free to move and the distal segment isn’t fixed to a surface. When the limb is off the ground, the end of the chain isn’t bearing weight, so the segment can move independently and joints are acted on in isolation. That contrasts with a closed chain condition, where the distal end is fixed on a surface (like feet planted or hands on the floor) and multiple joints move together. Isometric and concentric describe types of muscle contraction rather than chain status, with isometric being static length and concentric involving muscle shortening. So the scenario described matches open chain movement.

Open chain movement means the limb is free to move and the distal segment isn’t fixed to a surface. When the limb is off the ground, the end of the chain isn’t bearing weight, so the segment can move independently and joints are acted on in isolation. That contrasts with a closed chain condition, where the distal end is fixed on a surface (like feet planted or hands on the floor) and multiple joints move together. Isometric and concentric describe types of muscle contraction rather than chain status, with isometric being static length and concentric involving muscle shortening. So the scenario described matches open chain movement.