1. CHAPTER 15 LESSON 3: THE MUSCULAR SYSTEM

2. FUNCTIONS OF THE MUSCLES All movement Pump blood throughout the body (HEART) Move food thru digestive system Control air movement in and out of lungs Work by means of opposing action (CONTRACTION & EXTENSION)

3. TYPES OF MUSCLES SMOOTH MUSCLE SKELETAL MUSCLE CARDIAC MUSCLE

4. SKELETAL (striated/voluntary): attached to the bones allow movement to occur –Over 600 voluntary muscles in the body

5. CARDIAC (involuntary): forms the walls of the heart Contracts 100,000 times/per day SMOOTH (involuntary): concerned with the movements of internal organs

6. CARE OF THE MUSCLES MAINTAIN MUSCLE “TONE” –Tone is the natural tension of the fibers of the muscles –Keep active and eat balanced nutritious meals

7. PROBLEMS LACTIC ACID BUILDUP: Causes the ‘ache’ and pain in muscles MUSCULAR DYSTROPHY: Inherited disorder that causes the muscles to waste away.

8. MUSCLE INJURIES STRAINS: “pulled muscle” tearing or stretching caused by suddenly pulling them too far. BRUISE: bleeding of the muscle under the skin. (blood vessels break)

9. MORE MUSCLE INJURIES TENDINITIS: inflammation of the tendons HERNIA: the protrusion of an organ through the weak area of the muscle; usually occurs after heavy lifting, usually requires surgery to correct