1. Musculoskeletal System
Muscular Organs: no organs in the musculoskeletal system
Muscular Tissue: skeletal muscle tissue and connective tissue
Muscular Cells: skeletal muscle cells
Molecules: Proteins (sarcomeres) and actin

2. Muscular System - muscle cells and tissues are specifically designed for movement. Attaching to bones they can react to electronic stimuli from nerve cells causing them to contract (shorten) thus moving

3. Key Terms for normal muscle movement
Flexation - a bending that decreases the angle between the bones
Extension - a straightening to increase the angle between the bones

4. Masseter - chewing action
Rhomboid and Trapezius - Extension of the neck
Rectus abdominal - flexation of the torso
Deltoid - Extension of the arm
Biceps Brachii (flex the forarm) and Triceps
brachii (extends the forarm)
Flexor carpi radialis and Flexor carpi ulnaris (Flex the hand)
Extensor carpi radialis and Extensor carpi ulnaris (Flex the hand)
Extensor digitalis - Extension of the hands
Gluteus maximus (medius and minimus) - (Extension of the hip)
Anteria Thigh (Quadraceps) (Flex of upper leg and extend lower leg)
Posteria Thigh (Extension of the upper leg and flex lower leg)
Calf (extension of the foot)

5. A healthy muscular system therefore:
has intact muscles that allow for free and normal movement.
Correct flexion and extension at rest.
Correct felxion and extension at movement.