1. Skeletal, Muscular and Nervous Systems
Chapter 14
Skeletal, Muscular and Nervous Systems

2. Muscular System Allows for voluntary and involuntary movement
Like rubber bands, they are elastic and stretch to allow a wide range of motion
Moves bones and organs
Consist of long, fibrous cells that can shorten and stretch
Involuntary; breathing, heart beat, digestion
Voluntary; catch a ball, walk across the street

3. Types of Muscles
Smooth- muscles that act on the lining of the body’s passageways and hollow internal organs
Skeletal- muscles attached to bone that cause body movements
Flexor- muscle that closes a joint
Extensor- muscle that open a joint
Cardiac- type of striated muscle that forms the wall of the heart

4. Caring for Your Muscles
Get regular exercise
Eat high protein foods to build muscle
Practice good posture to strengthen back muscles
Use proper equipment during physical activity
Warm up properly and stretch before exercising and cool down after exercising

5. Muscular Problems
Bruises- areas of discolored skin that appear after a blow to the body
Strains or sprains- when muscles are stretched or partially torn from overexertion
Tendinitis- inflammation of a tendon
Hernia- when an organ or tissue protrudes through an area of weak muscle
Muscular dystrophy- an inherited disorder in which skeletal muscle fibers are progressively destroyed