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Muscular System Guided Reading 1. What are the four functions of the Muscular System? • Moving bones • Pumping blood • Moving food through digestive system • Controlling air movement in and out of the lungs 2. What causes muscular contraction? • The brain sends a signal through the spinal cord to move a muscle • Eventually the signal reaches the nerves attached to that muscle • The nerve then fires, which stimulates the muscle fibers to move in the desired fashion 3. Muscle Tone is defined as? • Muscle tone is a degree of firmness that your body keeps in your muscular structure at all times 4. What are muscles made up of? • Muscles are made up of a mass of fibers grouped together 5. What are muscle fibers made up of? • Muscle fibers are made up of smaller fibers called myofibrils 6. List three types of muscles. Where are they and are the voluntary or involuntary? • Smooth Muscles – Intestines & Blood Vessels – Involuntary • Skeletal Muscles – Attached to bones – Voluntary • Cardiac Muscles – Heart – Involuntary 7. What are 4 problems with the muscular system? • Muscle Strain – Painful stretching or tearing of muscle fibers • Muscle Cramp – A muscle contracts spasmodically or involuntarily • Myasthenia Gravis – Disease where muscles are weak or easily fatigued • Muscular Dystrophy – Crippling disease where skeletal muscles waste away 8. List two ways to care for the muscular system • Regular Exercise • Working on maintaining good posture