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The Muscular System. Muscles Facts Are there more muscles or bones?Are there more muscles or bones? – Muscles (around 640) Each lb of muscle burns 75-

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Presentation on theme: "The Muscular System. Muscles Facts Are there more muscles or bones?Are there more muscles or bones? – Muscles (around 640) Each lb of muscle burns 75-"— Presentation transcript:

1 The Muscular System

2 Muscles Facts Are there more muscles or bones?Are there more muscles or bones? – Muscles (around 640) Each lb of muscle burns calories a day just by beingEach lb of muscle burns calories a day just by being

3 Muscles Facts (cont.) Approximately 40% of your body weight is muscleApproximately 40% of your body weight is muscle Largest muscle = gluteus maximusLargest muscle = gluteus maximus

4 Muscles Facts (cont.) Smiling uses 17 musclesSmiling uses 17 muscles Frowning uses 43 musclesFrowning uses 43 muscles

5 Muscle Basics Muscles are made of bundles of protein fibersMuscles are made of bundles of protein fibers

6 Types of Muscle 1. Skeletal muscle attached to bones of skeleton Voluntary (we control them)  most of the meat we eat is this tissue

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8 Types of Muscle (cont) 2. Cardiac muscle found only in heart not connected to bone involuntary (we don’t control)

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10 Types of Muscle (cont.) 3. Smooth muscle found in organs & blood vessels not connected to bone involuntary

11 Muscular System Problems Strain: tearing of fibersStrain: tearing of fibers Cramp: not enough oxygen, overuseCramp: not enough oxygen, overuse Muscular Dystrophy: nerve messages to muscles are blockedMuscular Dystrophy: nerve messages to muscles are blocked

12 Steroids Increase rate of muscle growthIncrease rate of muscle growth Stop bone growthStop bone growth Side Effects: Heart attack, shriveled testes, etc.Side Effects: Heart attack, shriveled testes, etc.

13 Exercise & Muscles When muscles are not used the cells become smaller & weakerWhen muscles are not used the cells become smaller & weaker Two main types of exercise: aerobic & anaerobicTwo main types of exercise: aerobic & anaerobic

14 Aerobic Exercise Oxygen used rapidly by musclesOxygen used rapidly by muscles  Uses slow twitch muscle Glucose broken downGlucose broken down Ex: swimming & joggingEx: swimming & jogging

15 Anaerobic Exercise High intensityHigh intensity  Uses fast twitch muscle Glucose converted to lactic acid (muscle burn)Glucose converted to lactic acid (muscle burn) Ex: sprinting & weight liftingEx: sprinting & weight lifting


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