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TOPIC: Locomotion Aim: Explain the structure and functions of the 3 types of muscles. Do Now: Explain what makes up a joint. http://www.youtube.com/watch?v=Y1abT50xXyk HW: Ditto – Skeletal System Matching Column Did you know……………. • You have over 30 facial muscles which create looks like surprise, happiness, sadness, and frowning. • Eye muscles are the busiest muscles in the body. Scientists estimate they may move more than 100,000 times a day! • The largest muscle in the body is the gluteus maximus muscle in the buttocks. Function of • Locomotion the muscular • Move by contracting system (shortening) and relaxing Difference between voluntary and involuntary muscles • Voluntary muscles: you are able to control –Examples: Arm & leg muscles • Involuntary muscles: you do not control consciously (w/o thinking about it) –Example: Muscles that make up your stomach & heart 3 TYPES OF MUSCLES Smooth Muscle • Non-striated (no stripes) • Involuntary • Line your internal organs (digestive system, blood vessels…) Cardiac Muscle • ONLY in the HEART • Involuntary • Striated (have stripes) • Fibers branch Skeletal • Attached to bones Muscle • Voluntary • Striated • Work in pairs. – One contracts while the other relaxes How do muscle cells get energy? • Aerobic respiration (needs oxygen) Glucose Energy + + Water Oxygen + Carbon Dioxide http://www.brainpop.com/health/bodysystems/muscles/ Review: Identify the muscle being described. 1. Involuntary 2. Striated 3. Found in the heart 4. Lines internal organs 5. Voluntary 6. Branched fibers 7. Attached to bones