1. Made by : Mauricio De los Santos Juan Carlos Campos Mariano Velasquez

2. Is the union of 650 muscles in the body, whose primary function is to generate movement. The system allows skeletal system to move, maintain its stability and the shape of the body.

3.  A pulled muscle: or muscle strain is a partial or complete rupture of muscle fibers made it by a strong impact. Besides being affected muscle fibers, may also be affected surrounding structures such as connective tissue surrounding blood vessels.

4.  A sprain: is injury to the ligaments that hold the two bones forming a joint. If the injury is so important that the ligament can no longer hold the bones in place and they are separated, is a dislocation diagnosed.

6.  Volunteers: controlled by person  Involuntary or visceral, directed by the central nervous system  Autonomous: its function is to contract regulary without stopping.  Mixed: mucles controlled by person and nervous system, such as the eyelids.

7.  Muscle spindle shaped bone  Flat and wide, are found in the chest (abdominal)  Abanicoides or fan, or pectoral muscles of the jaw temporary.  Circular ring-shaped muscles.  Orbicular, similar to muscle spindle

8.  They are: 1. Diaphragm 2. Gluteus major and minor 3, deltoid 4. Biceps brachii 5. Triceps 6. Quadriceps femoris 7. Straight lateral head 8. Risorius of santorini 9. Trapeze 10. Twins  11. Pectoral width 12. Zygomatic 13. Front 14. Occipital 15. Intercostal 16. Serratos 17. Borla beard 18. Orbicularis and mouth 19. Masseter 20. Sternocleidomastoid

9.  Monografias  Haroldflores.com http://www.haroldflores.com/blog_desgarros- musculares.php  Espalda.org http://www.haroldflores.com/blog_desgarros- musculares.php  Yahoo answers