1. The Muscular System Chapter 3, Lesson 1 Part 2

2. Introduction to the Muscular System  Deltoid  Trapezius  Triceps  Biceps  Abdominal Muscles  Quadriceps  Gastrocnemius  Anterior Tibial

3. Introduction to the Muscular System  How many muscles are in the human body?  600  Which muscle is the most important?  Heart

4. 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

5. Tendons connect your muscles to bones!

6. 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 http://kidshealth.org/kid/htbw/_bfs_MSmoviesource.ht ml

7. 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

8. 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.

9. 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!

10. 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.

11. 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.