How do joints let the body bend and twist?
Quick Answer
Joints are places where bones meet, and their shape determines how much movement is possible. Ball-and-socket joints move in many directions, while hinge joints mainly bend and straighten.
The Full Story
Different joint types allow different kinds of movement. The shoulder and hip are ball-and-socket joints, which allow rotation and a wide range of motion, while the elbow and knee are hinge joints that act more like door hinges. Cartilage covers the bone ends to reduce friction, and synovial fluid helps joints move smoothly. Ligaments and surrounding muscles help stabilise the joint and prevent injury. Joint structure is a major reason humans can both perform fine hand movements and powerful leg motions.
Key Facts
YouTube Angle
Suggested video title for this topic:
"The engineering hidden in every bend and twist of your body"