Muscular System

2. The fiber bundles in muscles receive signals from the _______ ______
4. The ________ ______ are located in between bones
6. The muscular system is related to the respiratory system by allowing air containing 20% ______ to enter the lungs with the increased volume
7. Muscles are attached to bones by _______ and help them to move. When a muscle contracts, it gets shorter and so pulls on the bone it is attached to. When a muscle relaxes, it goes back to its normal size. Therefore muscles have to work in pairs to move a joint.
9. The ______ ______ are located in the walls of the heart
11. Those signals contract the ______, which in turn generates force and motion
12. Muscles, attached to bones or internal organs and blood vessels, are responsible for ________
13. Skeletal muscles are also called _______ muscles
14. Your _____ _____ are located in the stomach and intestines
15. A person has more than 600 _____

1. The muscular system is related to the respiratory system by how the enriched Oxygen air diffuses into the Oxygen poor blood in the _________ ___________. This is the function of the respiratory system
3. The muscular system is related to the ___________ ______ by the muscular system using the diaphragm to enlarge the volume of the lungs
5. The ______ ____ is composed of specialized cells called muscle fibers. Their predominant function is contractibility.
8. Almost all movement in the body is the result of ______ contraction
10. An _____ ______ consisting of skeletal, smooth, and cardiac muscles