Muscles

Muscles - This causes them to slide. Muscle Contraction...

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Muscles
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Skeletal Muscle Voluntary : controlled consciously Striations : light and dark bands Have many nuclei
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Smooth Muscles Found in organs or blood vessels. Involuntary: Not under conscious control One nucleus
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Cardiac Muscle Found on the heart. One or two nuclei. Involuntary control.
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Flexor Bends the bone at the joint. Ex: Bicep
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Extensor Makes the bone straighten at the joint.
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Muscle Contraction (Microscopic) Myofibril: Small fibers found within the cells of muscles. *Myofibrils are made of two type of filaments.
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Actin Filaments Thin filaments made of a protein called actin.
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Myosin Filaments Thick filaments made of a protein called myosin.
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Muscle Contraction Step #1 Actin filaments are stimulated to slide over the myosin filaments. ** The heads of the myosin filaments connect to the actin and pivot.
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Unformatted text preview: This causes them to slide. Muscle Contraction Step #2 When the actin filaments slide the length of the sarcomere becomes shorter. Muscle Contraction Step #3 When the sarcomeres become shorter this causes each myofibril to become shorter. Myofibril Contractile Proteins Skeletal Muscle Cell Muscle Contraction Step #4 When each myofibril becomes shorter it causes the muscle fibers to become shorter. Muscle Contraction Step # 5 When each muscle fiber shortens the overall muscle contracts. What Stimulates a Muscle? 1. Contractions are coordinated with your nervous system: motor neurons. 2. A stimulated neuron will cause the release of calcium in the muscle. 3. Calcium causes the interaction between the myosin and actin filaments....
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Muscles - This causes them to slide. Muscle Contraction...

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