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The muscular system. Three types of muscle Smooth muscle is an involuntary muscle. Example – digestive system Cardiac muscle is an involuntary muscle.

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Presentation on theme: "The muscular system. Three types of muscle Smooth muscle is an involuntary muscle. Example – digestive system Cardiac muscle is an involuntary muscle."— Presentation transcript:

1 The muscular system

2 Three types of muscle Smooth muscle is an involuntary muscle. Example – digestive system Cardiac muscle is an involuntary muscle found in the heart. Has pronounced striations. Skeletal muscle are voluntary muscles that are used to move bones.

3 Skeletal muscle contraction Muscles are arranged in opposing pairs. Muscle fibers consist on myofibrils. Myofibrils are made of actin and myosin (protein) subunits. A sarcomere is the functional unit of a muscle.

4 How do muscles move? Muscles move by contracting and then relaxing. Sliding filament theory is used to explain muscle contraction. http://bcs.whfreeman.com/thelifewire/conten t/chp47/4702001.html http://bcs.whfreeman.com/thelifewire/conten t/chp47/4702001.html How is a muscle contraction triggered?

5 Muscle fiber

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