1. Chapter 14 Lesson 2 – The Muscular System

2. FUNCTIONS All movements Pump blood throughout body
Move food through digestive system
Control movement of air in and out of your lungs

3. Contraction = the shortening of a muscle
Extension = the stretching of a muscle
Example – bicep/tricep

4. 3 TYPES OF MUSCLES SMOOTH MUSCLE
Type of muscle concerned with movements of internal organs
Intestines, bronchi of lungs, the bladder,
Involuntary – work without control
SKELETAL MUSCLE
Striped, or striated, muscles attached to bones that cause body movements
Form the largest part of the body’s M.S. ( > 600)
Voluntary - under conscious control
CARDIAC MUSCLE
Special type of striated tissue that forms the walls of the heart
Heart is most important muscle in body

5. 3 TYPES OF MUSCLES
SMOOTH
SKELETAL
CARDIAC

6. Care of muscular system
More use = more efficient/strong
Exercise strengthens the heart (more blood pumped in a 1 beat)
Practice good posture
Increase muscle tone
Eat nutritious foods
“Use it or lose it” – an unused
muscle will atrophy,
or waste away

7. Lasting PROBLEMS Muscular dystrophy Inherited disorder
Progressive wasting away of skeletal muscles
No cure, but weakening can be delayed with exercise

8. INJURY RELATED PROBLEMS
MUSCLE STRAIN
BRUISE
aka “pulled muscle” = tearing or stretching of muscle fibers
Usually occur in large muscles
Treatment = ice, wrap, rest
Discolored area under the skin caused by leakage of blood after an injury
Treatment = ice can reduce pain/swelling

9. INJURIES CONT… Inflammation of a tendon usually caused by overuse
TENDINITIS
HERNIA
Inflammation of a tendon
usually caused by overuse
Symptoms = pain,
tenderness, restricted movement
Treatment = anti-inflam. meds
Protrusion of an organ or tissue through a weak area in the muscle
Abdominal – protrudes through weak area in abd. wall
may appear after lifting heavy objects
Surgery