1. The Muscular System

2. How many muscles are in the human body????
approximately 850
650 are
skeletal muscles
200 make up
cardiac and smooth

3. There are four characteristics associated with muscle tissue:
Excitability
Contractility
Extensibility
Elasticity
- Tissue can receive & respond to stimulation
- Tissue can shorten & thicken
- Tissue can lengthen
- After contracting or lengthening, tissue always wants to return to its resting state

4. The characteristics of muscle tissue enable it to perform some important functions, including:
Movement – both voluntary & involuntary
Maintaining posture
Supporting soft tissues within body cavities
Maintaining body temperature

5. Types of muscle tissue:
Cardiac – myocardium of the heart (involuntary)
Skeletal – attached to bone (voluntary)
Smooth (Visceral) – organs/blood vessels (involuntary)

6. Skeletal muscle movements
Flexion/extension; Abduction/adduction; Inversion/eversion
Rotation – left/right; internal(medial)/external(lateral)
pronation/supination; Elevation/depression
Protraction/retraction; Dorsiflexion/plantar flexion

7. Sternocleidomastoid
(neck)

8. Deltoid
(shoulder)

9. Pectoralis Major
(breast)

10. Bicep Brachii
(stud muscle)

11. Flexors
(forearm “Popeye”)

12. Rectus Abdominis
(6 pack abs)

13. External Oblique
(side abs)

14. Rectus Femoris
(Quads)

15. Sartorius
(longest muscle)

16. Trapezius
(traps)

17. Latissimus Dorsi
(back lats)

18. Tricep Brachii
(tris)

19. Extensors
(back of forearm)

20. Gluteus Maximus
(gluts or buttocks)

21. Bicep Femoris
(hamstrings)

22. Gastrocnemius
(calf)

23. Achilles Tendon
(not a muscle)

24. Tendon attaches from the gastrocnemius (calf)
to the calcaneus bone

25. Achilles tendon tear