1. Muscular System

2. Did you know you have more than 600 muscles in your body?
They help you do almost everything — from pumping blood throughout your body to lifting heavy weights.
You control some of your muscles and others, like your heart, do their jobs without you thinking about them at all.

3. Muscles are all made of the same material, a type of elastic tissue (sort of like the material in a rubber band).
Thousands, or even tens of thousands, of small fibers make up each muscle. You have three different types of muscles in your body:
smooth muscle
cardiac muscle
skeletal muscle.

4. Smooth Muscle On the lining of passageways and internal organs.
Blood vessels
Digestive tract
Passageways that lead to the lungs and bladder
Involuntary control

5. Skeletal Muscle Attached to bone and cause body movements
Striated, or striped, appearance
Skeletal muscle makes up most of muscle tissue
Almost all is voluntary

6. Skeletal Muscle
Skeletal muscles often work together, undergoing opposing actions
One muscle contracts as another extends
Bicep and tricep
Flexor- the muscle that closes the joint (bicep)
Extensor- the muscle that opens the joint (tricep)

7. Cardiac Muscle
A type of striated muscle that forms the wall of the heart.
Involuntary
Responsible for the contraction of the heart.
The heart contracts rhythmically about 100,000 times each day to pump blood throughout your body.

8. Care of the Muscular System
Regular physical activity
Muscles that remain unused for long periods of time will atrophy.
Atrophy- decrease in size and strength
Muscle tone
The natural tension in the fibers of the muscle

9. Problems with the Muscular System
Bruise
This happens when blood vessels under the skin rupture and leak.

10. Problems with the Muscular System
Muscle strain or sprain
A strained muscle usually occurs when a muscle is stretched or partially torn as a result of overexertion.
A sprain is an injury to the ligament in a joint, and it requires medical treatment.

11. Problems with the Muscular System
Tendonitis
Inflammation of a tendon
Caused by:
Injury
Overuse
Natural aging
Signs
Swelling
Pain
Swelling that worsens with activity

12. Problems with the Muscular System
Hernia
When an organ or tissue protrudes through an area of weak muscle.
Results from straining to lift a heavy object
Usually requires surgery

13. Problems with the Muscular System
Muscular Dystrophy
An inherited disorder in which skeletal muscle fibers are progressively destroyed.
No cure
With early detection muscle weakness can be delayed through exercise programs.