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The Muscular System Chapter 3, Lesson 1 Part 2 Introduction to the Muscular System Deltoid Trapezius Triceps Biceps Abdominal Muscles Quadriceps Gastrocnemius Anterior Tibial Introduction to the Muscular System How many muscles are in the human body? 600 Which muscle is the most important? Heart Facts About Your Muscles Help you move and maintain posture Both needed to maintain good skeletal system health! Make up ½ of your body weight They are working all the time, even when you are standing or sitting still. Each muscle has a very specific job. Muscles are typically grouped in pairs Examples: Triceps and Biceps, Quadriceps and Hamstrings Tendons connect your muscles to bones! How our muscles work: All muscles work on the same principle: They contract (shorten) and relax (lengthen) to cause movement. http://kidshealth.org/kid/htbw/_bfs_MSmoviesource.ht ml Types of Muscles Voluntary: Muscles that you control Muscles that help you open and close your hand and muscles in your leg that help you walk. Examples? Involuntary: Muscles that you do not control. Examples: Heart, Intestinal Muscles, Stomach Muscles Types of Muscles Smooth: Muscle found in body organs, blood vessels, and glands. Smooth muscle is involuntary. Cardiac: Muscle is only found in the walls of the heart. Is an involuntary muscle that continuously contracts and relaxes to pump blood through the body. Muscular Problems Strain: Muscle is stretched too far. Cramps: Muscle contracts and doesn’t relax. Low Back Pain: Caused by poor posture or weak core muscles. Can also be caused by a lack of exercise. Heavy backpacks! Muscular Problems Back Pain: Heavy backpacks – Students who carry overloaded backpacks might be endangering their backs. When backpacks are too heavy, students lean forward, which can lead to rounded shoulders and a curved upper back. Some orthopedists recommend that a backpack should weigh no more than 15 percent of a student’s weight. Caring for your Muscular System Sleep in the fetal position on a firm mattress. Exercise regularly. Warm up before exercising. Select foods containing carbohydrates or proteins. Practice weight management. Lift objects by bending your knees.
