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muscle wallpapers

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Arnold Schwarzenegger Inspiration black and white bodybuilding muscle
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2nd Gen Camaro
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1967 Chevrolet Camaro
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Chevrolet Camaro
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1972-Chevelle
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Dodge Challenger RT
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1969 Pontiac Firebird Trans Am
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Challenger
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Muscle Car
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1965 Mercury Cyclone
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1970 Buick GSX
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Roadrunner
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1968 Dodge Dart
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1976-79 Pontiac Firebird Trans Am
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Plymouth Barracuda
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Dale Jr's Chevelle
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1970 Charger
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Pure Detroit Muscle
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Dodge Challenger Hemi
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1969-Dodge-Charger-500
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1968-Pontiac-Gto
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1970-Ford-Mustang
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Vin Diesel
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MOPAR
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Muscle is a soft tissue found in most animals. Muscle cells contain protein filaments of actin and myosin that slide past one another, producing a contraction that changes both the length and the shape of the cell. Muscles function to produce force and motion. They are primarily responsible for maintaining and changing posture, locomotion, as well as movement of internal organs, such as the contraction of the heart and the movement of food through the digestive system via peristalsis. Muscle tissues are derived from the mesodermal layer of embryonic germ cells in a process known as myogenesis. There are three types of muscle, skeletal or striated, cardiac, and smooth. Muscle action can be classified as being either voluntary or involuntary. Cardiac and smooth muscles contract without conscious thought and are termed involuntary, whereas the skeletal muscles contract upon command. Skeletal muscles in turn can be divided into fast and slow twitch fibers. Muscles are predominant...

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