1. Muscular System

2. Muscle Facts There are over 600 different muscles in the human body
Body contains three muscle types: skeletal, cardiac, and smooth
Skeletal muscles are voluntary muscles
Cardiac and smooth muscles are involuntary

3. Functions of Muscles Work with bones to create movement
Gives body shape and support
Protection for vital organs
Vital bodily functions (heartbeat, digestion, excretion of waste, etc.)
Contractions create heat to maintain a normal body temperature

4. Skeletal Muscles Make up approx. 40% of body mass Work in pairs
Named for shape, location, function
Connected to bones by tendons
Can grow in size with repeated
resistance work
Can contract quickly, but get tired
easily and must rest

5. sterno-mastoid
Head movement
“yes” and “no”

6. Trapezius (upper back, neck)
Pulls head and upper arms back
“yes” and “no” movement
Work with deltoids to lift
arms

7. Trapezius (developed)

8. Pectorals (chest)
Move arms to center of
body
Press away

9. Deltoid (shoulder cap)
Lifts arms to shoulder height
Named for Greek letter “D”

10. Biceps
Flexes forearm; palm up

11. Triceps
Extends forearm;
Fixes elbow when
writing

12. Brachioradialis
Flexes forearm,
palm down

13. Latissimus dorsi
Pulls arms down and
back; give body “V”
shape

14. For real???????

15. Abdominals
Protects internal organs
Helps hold body erect

16. Gluteus maximus
Lifts leg backward
Helps hold body erect

17. Hamstrings
Flex knee to buttocks

18. Quadriceps (quads)
Four muscles groups
Extends lower leg

19. Sartorius
Longest muscle
Allows leg crossing

20. Tibialis
Pulls toes toward face

21. Gastrocnemius (calf)
Extends toes

22. Achilles Tendon Connects calf muscle to heel Named for Achilles of
mythological fame

23. Human Muscular Anatomy

24. “I’ll be back!