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

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

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

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)

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.

https://www.youtube.com/watch?v=Ktv-CaOt6UQ

https://www.youtube.com/watch?v=I80Xx7pA9hQ