Open chain movements are defined as what?

• A. Closed chain movement refers to the distal end fixed to earth
• B. Open chain movement refers to the distal end moving freely in space, where the distal end is NOT FIXED. (Correct)
• C. Midline stabilization
• D. Lipoproteins carry fats in the bloodstream

Answer: (B)

Open chain movements occur when the end segment farthest from the body moves freely in space and is not anchored to a surface. Because the distal end isn’t fixed, the joint at that end can move independently, which is why exercises like a leg extension or a dumbbell curl isolate the targeted muscles. This is in contrast to closed chain movements, where the distal segment is fixed to the ground or another surface, producing more joint integration and stability. The other options don’t describe this concept: midline stabilization isn’t about whether the distal segment moves freely, and lipoproteins relate to fat transport in the bloodstream, not movement type.