Please write in complete sentences!! Do Now – 12/04/18 What is the muscular system? About how many muscles do we have in our bodies? Please write in complete sentences!!

Muscular System Mrs. Hill

The Muscular System A group of tough tissues that make your body parts move

there are over 600 muscles in the body There are over 30 muscles in your face alone The strongest muscle is the Heart

Functions of the Muscular System Your muscles are responsible for moving your bones, pumping blood, digesting food, and breathing

*tendons connect muscle to bone Ligament connects bone to bone

Kinds of Muscle Fibers 1. Voluntary- Skeletal Muscle- The muscles you control. Made up of striated muscle fibers (legs, arms) make up 50% of our body weight.

2. Involuntary- Smooth Muscle- Muscles that work without your direct control. Consists of smooth muscle fibers (stomach and intestines).

3. Cardiac Muscle- The Heart- Works on its own 3. Cardiac Muscle- The Heart- Works on its own. Controlled by the autonomic nervous system.

Problems of the Muscular System 1. Muscle Soreness (strain)- caused by lactic acid, which builds up in the muscle when you exercise. Stretching and warming up before and after exercise can help with lactic acid build up. Sprain is when a ligament is stretched or torn.

2. Pulled Muscle- muscle sheath is in spasm 2. Pulled Muscle- muscle sheath is in spasm. Ice, stretching, and light weight training may be prescribed.

3. Torn Muscle- muscle fibers are actually ripped or torn away from the bone, surgery may be necessary.

4. Muscle Cramps- Muscle is unable to relax 4. Muscle Cramps- Muscle is unable to relax. Can be injury or fatigue related. Loss of mineral, potassium and sodium, also a cause.

5. Tendonitis- inflammation of a tendon

Muscular Dystrophy- commonly an inherited disorder where the muscles become weak and atrophy (shrink) until walking and basic movement is not possible. There is no cure, but therapy can keep muscles working longer.