Presentation on theme: "Section 11.2 Your Muscular System Slide 1 of 16 Myth No pain, no gain. Fact Pain is not a sign of a good workout. Rather, pain is a signal from your body."— Presentation transcript:
Section 11.2 Your Muscular System Slide 1 of 16 Myth No pain, no gain. Fact Pain is not a sign of a good workout. Rather, pain is a signal from your body that you are working too hard or you have an injury. Continuing to exercise through the pain could lead to a more serious injury. Where do you think most teens get their information about muscles? How factual do you think their information is?
Section 11.2 Your Muscular System Slide 2 of 16 Goals/Objectives Describe the functions of the three types of muscles. Explain how you can keep your muscular system healthy. Section 11.2 Your Muscular System
Section 11.2 Your Muscular System Slide 3 of 16 Key Terms Muscular SystemThe body system that consists of muscles that provide motion and maintain posture.
Section 11.2 Your Muscular System Slide 4 of 16 Muscles move your eyes as you read. The Muscles in Your Body Muscles in your chest allow you to breathe. Muscles in your heart pump your blood. Every time your body moves, muscles are at work.
Section 11.2 Your Muscular System Slide 5 of 16 Your body has three types of muscle tissue that perform different functions. Types of Muscle Smooth muscle - is involuntary muscle that found in many internal organs. causes movements within your body. Cardiac muscle - is involuntary muscle that is found only in the heart. Skeletal muscles – is voluntary muscle tissue that is attached to bones you control to do activities, such as walk or play a musical instrument.
Section 11.2 Your Muscular System Voluntary vs Involuntary Muscles Voluntary muscle is a muscle that a person can control. Involuntary muscle is a muscle that functions without a person’s control. Slide 6 of 16
Section 11.2 Your Muscular System Slide 7 of 16 All muscles do work by contracting, or becoming shorter and thicker. How Muscles Work Many skeletal muscles work in pairs. One muscle in the pair contracts to move the bone in one direction. Then, the other muscle in the pair contracts to move the bone back.
Section 11.2 Your Muscular System Slide 8 of 16 Muscle Pairs Biceps contracted Biceps relaxed Triceps relaxed Triceps contracted
Section 11.2 Your Muscular System Tendons A thick strand of tissue called a tendon attaches a muscle to a bone. Slide 9 of 16
Section 11.2 Your Muscular System Slide 10 of 16 Even when a skeletal muscle is not contracting to cause movement, a few of its individual muscle fibers are still contracting. Muscle Tone Contractions tense and firm the muscle. This slight tension is called muscle tone. Muscles that cannot contract due to injury, or are not used often, will weaken and shrink, a condition known as atrophy.
Section 11.2 Your Muscular System Slide 11 of 16 1 2 3 4 5 6 7 8 9 10 11 12 13 The Muscular System 1) Frontalis 2) Temporalis 3) Trapezius 4) Deltoid 5) Pectoralis major 6) Sartorius 7) Tibialis anterior 8) Biceps 9) Triceps 10) External oblique 11) Rectus abdominus 12) Quadriceps muscles 13) Gastrocnemius
Section 11.2 Your Muscular System Slide 13 of 16 Frontalis 26 27 28 29 Sartorius 30 31 32 33 34 35 Gastrocnemius
Section 11.2 Your Muscular System Slide 14 of 16 You can maintain a healthy muscular system by regularly participating in different types of exercise. Keeping Healthy To help prevent injuries, exercise sessions should include a warm-up and cool-down period.
Section 11.2 Your Muscular System Slide 15 of 16 Some types of exercise increase a muscle’s endurance—how long it can contract without tiring. Working Your Muscles Other exercises make individual fibers grow, which causes the muscles to thicken and increase in strength. Anabolic steroids - are artificial forms of the male hormone testosterone.
Section 11.2 Your Muscular System Slide 16 of 16 Strains - A muscle strain, or a pulled muscle, is a painful injury that may happen when muscles are overworked or stretched too much or too quickly. Avoiding Muscle Injuries Tendonitis - Overuse of tendons may lead to painful swelling and irritation called tendonitis. Prevent injuries regular strengthening and stretching exercises vary your exercise routine warm up and cool down stop exercising if you feel a sharp or sudden pain
Section 11.2 Your Muscular System Slide 17 of 16 A muscle cramp is a strong, uncontrolled muscle contraction. Preventing Muscle Cramps To relieve a cramp, try massaging the affected area and exercising the limb gently. Stretching and drinking plenty of water before and during exercise can help you avoid muscle cramps.
Section 11.2 Your Muscular System Questions 1.Identify 3 types of muscle and describe location and function of each. 2.What is a tendon? 3.Explain what causes muscle tone? 4.What causes the condition known as atrophy? 5.What can you do to prevent muscle injuries? 6.What is the cause of a muscle strain? 7.Why is it an advantage that you do not have control over all of your muscles? 8.Describe how a muscle pair in your thigh would work to bend and then straighten your knee. 9.What type of muscle helps your to move your jaw to chew food? 10.Name an exercise that builds muscle endurance. Slide 18 of 16