Muscular system

1. Light contractions that create tension within the muscle but doesn't have enough force to move it
3. What makes up myofibrils and regulates muscle contraction
4. An organ of the muscular system primarily comprised of cells called muscle fibers, which can contract.
8. A complete or lasting muscle contraction that occurs after a motor neuron sends out multiple nerve impulses in rapid succession
12. A contraction that produces movement
14. A type of striated muscle tissue found within the walls of the heart that causes the heart to beat through the automatic nervous system
15. A natural condition where the skeletal muscle stays partially contracted at all times. This helps to prevent damage to the muscles and joints from sudden movements, and maintain body posture.
16. A type of striated muscle tissue that is attached to bone that controls intentional physical actions. It acts through the somatic nervous system

2. The point where motor neurons release chemicals to start muscle contraction
5. What controls skeletal muscles, individuals control motor units.
6. The membrane of muscle fibers and conductor of electrical signals to the muscle cell.
7. Organelles in muscle fibers that causes the muscles to contract by shortening.
9. Several muscle cells in a group with one function
10. A type of non striated muscle tissue that is found in the walls of many different internal organs that constricts to move substances around. It acts through the automatic nervous system
11. A human body system that uses muscles and tendons
13. tough connective tissue that adheres muscles to bone.