1. 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

2. Movement Annotate a synovial joint
Describe antagonistic muscle contraction in the elbow joint and an insect leg

4. 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

6. Synovial Joint
Joint capsule
The elbow is a hinge joint that acts similarly to a door. (Also called a synovial joint)

7. 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