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Download Muscles - Maria Regina
Transcript
The Muscular System Muscles • Muscles are organs that relax and contract, and provides the force to move your body parts – Voluntary muscles muscles you are able to control – Involuntary muscles muscles you cannot control Types of Muscle Tissue • Skeletal • Cardiac • Smooth Skeletal Muscle • Move bones • Most common type of muscle • Tendons thick bands of tissue that attach muscle to bones • Voluntary muscles • Contract quickly and tire more easily • Look striped, or striated Cardiac Muscle • Found only in the heart • Striated (like skeletal muscle) Smooth Muscles • Found in internal organs (like the intestines) • Involuntary • Contract and relax slowly Slides of Different Muscle Cells Movement • We can move because pairs of muscles work together – When one muscle of a pair contracts, the other relaxes • Muscles always pull • Over time, muscles become smaller or larger depending on whether or not they are used • Blood carries energy-rich molecules to the muscles so they can do their work Importance of Exercise • Exercise is very important! • The stronger your muscles are, the less stress is put on your bones/joints/heart • Aerobic exercise, like running/swimming/ biking, are especially helpful strengthen your cardiac muscles • Anaerobic exercise, like squats/weight lifting/push ups, help strengthen your skeletal muscles
