Muscles of the human body The Muscular System Muscles of the human body

Learning Goal: Describe the structure and function of the muscle system of the human body ISN 62-63

Learning scale: (where are you?)ISN 62-63 1. Define Week 30 vocabulary. 2.Describe involuntary and voluntary muscles. 3. Compare and contrast the function of muscles and their structure 4. Analyze ways to keep muscles healthy and describe at least one disease of the muscles.

Involuntary muscles do not have to think about these muscles. act on their own.

Involuntary muscles: 1. Smooth Muscles: work in the stomach and intestines for digestion Reacts slowly and tires slowly

Involuntary muscles cont’d 2. Cardiac Muscles: muscles found only in the heart striated (banded) Do not tire Contracts repeatedly in a heartbeat

Voluntary Muscles Skeletal muscles: banded or striated tire quickly Attach to and cover the skeleton

Voluntary muscles Muscles: -work in pairs -can only contract (cannot lengthen) -while one muscle contracts the other relaxes -tendons attach muscles to bones

Types of muscle fibers (cells)

Muscular Dystrophy 30+ inherited diseases Gradually weaken muscles Muscle loss occurs Limits movement Some onset in childhood