Attached to bones for movement From Stephen Taylor Muscles have to work in anatgonistic pairs because they can only shorten (or pull) on a bone (the lever). Muscles cannot push!!!! **** Also acts as source of blood cells/storage of minerals
Movement Annotate a synovial joint Describe antagonistic muscle contraction in the elbow joint and an insect leg
Antagonistic pair Arm flexed- 1. Biceps contracted (Thick and short) Scapula Arm flexed- 1. Biceps contracted (Thick and short) 2. Pull up Radius 3. Triceps relaxed (Long and thin) Arm extended- Triceps contracted (Thick and short) 2. Pull down Ulna 3. Biceps relaxed (Long and thin) Radius Ulna Look at the video
Synovial Joint Joint capsule The elbow is a hinge joint that acts similarly to a door. (Also called a synovial joint)
Outline the functions of the structures in the human elbow joint named in Joint Part Function Cartilage Synovial fluid Joint capsule Tendons Ligaments Biceps muscle Triceps muscle Humerus Radius Ulna