The Muscular System What do skeletal muscles do? How do muscles work?

The Muscular System Muscle is an organ that can relax and contract, and provides the force to move your body parts.

Tim and Moby film

A. Function of Skeletal Muscles Produce movement Maintain posture and body position Support soft tissue Guard entrances and exits Maintain body temperature

To move or not to move 1.  Voluntary muscles – muscles that you are able to control 2. Involuntary muscles – muscles that you cannot control

Three types of muscle Skeletal Cardiac Smooth

Skeletal Large muscles Maintain posture Facilitate (help with) locomotion Move jointed bones Joined to bones by tendons

Heart muscle cells behave as one unit Found only in the heart Cardiac muscle Main muscle of heart Heart muscle cells behave as one unit Found only in the heart Involuntary

Found in walls of internal organs Involuntary movement Smooth muscle Found in walls of internal organs Involuntary movement

Tendon ~ strong, tough connective tissue cord, connect muscle to bone Example *Achilles Tendon (attaches to calf muscle and heel bone)

Type of muscle movement Flexor Extensor Let’s look at each one

Flexion (Flexor) ~ decreasing the angle between two bones and body part

Extension ( Extensor) ~ increasing the angle between two bones and body part

Do you know who I am? Hint: I’m the governor of Cal.

The End