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Slide 2 Most muscles work together in pairs. One muscle pulls while the other muscle relaxes. When you bend your arm the biceps muscle pulls and the triceps muscle relaxes. When you make your arm straight, the biceps muscle relaxes and the triceps muscle pulls. Slide 3 Muscles are very important. They help you do almost everything from pumping blood throughout your body to lifting your heavy backpack. You control some of your muscles and others, like your heart, do their jobs without you thinking about them at all. Slide 4 You use 17 muscles when you smile. You use 43 muscles when you frown. Slide 5 Provides voluntary movement of body Enables breathing, blinking, and smiling Allows you to hop, skip, jump, or do push-ups Maintains posture Produces heat Slide 6 CCauses heart beat DDirects circulation of blood RRegulates blood pressure SSends blood to different areas of the body Slide 7 PProvides movement of internal organs MMoves food through digestive tract EEnables bladder control CCauses involuntary actions RReflex actions AAdjusts opening of pupils CCauses hair to stand on end: goosebumps. Slide 8 TThere are three main types of muscle tissue SSkeletal (striated) CCardiac (heart) SSmooth (visceral) Slide 9 Muscle Type Cardiac Function Movement of bone Walls of internal organs + in skin Location Attached to bone Heart SmoothSkeletal Control Mode Beating of heart InvoluntaryInvoluntary Movement of internal organs Voluntary Slide 10 _______- Muscle that bends the joint when contracted. _________- Muscle that straightens the joint when contracted. ___________ muscle is short, firm, tight and thicker around. ________ muscle is stretched, long, loose and thinner around. Flexor Extensor Relaxed Contracted Slide 11 MMuscles are bundles of cells and fibers. MMuscles work in a very simple way. All they do is tighten up--that is, contract--and relax. YYou have two sets of muscles attached to many of your bones which allow them to move. TThere are 630 active muscles in your body and they act in groups. MMuscles can only pull. They never push. Slide 12