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The Muscular System Human Biology & Health Chapter 2.3 Pages 50-54

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Try This: Sit perfectly still! That means move as little as possible Try not to move a muscle for a full 60 seconds Now relax! What did you notice about this exercise?

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Muscle-bound There are roughly 600 muscles in your body Used in every action you take Chewing, breathing, blinking, smiling, etc.

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Muscle Action Classified according to control Voluntary Voluntary: muscles you consciously control Involuntary Involuntary: muscles you do NOT consciously control Heart beating, digestion

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Types of Muscles 3 Types 1.Skeletal 2.Smooth 3.Cardiac Skeletal muscle is connected to your bones Tendons The muscle is connected to bone by Tendons React quickly but also tire quickly.

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Types of Muscles Involuntary muscles Not banded like Skeletal muscles. React more slowly and therefore tire slowly. 3 Types 1.Skeletal 2.Smooth 3.Cardiac

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Types of Muscles Similar to both Skeletal & Smooth muscles Involuntary and untiring like smooth Responds quickly and rapidly. 3 Types 1.Skeletal 2.Smooth 3.Cardiac

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Muscles at Work Put your pen at the far edge of your table Place your hands on your lap Slowly reach out and pick up your pen How do you think your muscles moved just now?

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Muscles at Work Make a muscle How are your muscles moving now? What is the lump being made by this motion?

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Working in Tandom Muscles can only contract They work in pairs: one muscle contracts, the other relaxes Biceps contract when you flex Triceps contract when you extend your arm.

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Exercise and Stretching Exercising your muscles makes them stronger after a brief warm-up Stretching (after a brief warm-up) helps prepare muscles for activity Increases range of motion and flexibility

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Muscle Injuries Strain Tendon Strain injuries occur when a muscle or Tendon tears Pulled muscles 1.Avoid activity that causes pain in pulled area 2.Ice it (no longer than 15 minutes at a time) 3.Elevate it to heart level.

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Muscle Injuries Sprain Sprain injuries occur when a joint is over- stretched or torn Ligaments Ligaments are tissue that connect bones 1.Ankle sprain 2.ACL / MCL knee sprains (Anterior / Medial cruciate ligament)

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Exit Pass What are the 3 kinds of muscle? What is the only way muscles can move? Star Systems & Galaxies (Ch3.4, p117-120)

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What to Work On In your notebook, outline Section 2.4, The Skin Answer the Review questions for both Section 2.3 (page 54, #s 1-4) and Section 2.4 (page 62, #s 1-3) Star Systems & Galaxies (Ch3.4, p117-120)