Movement (11.2)
Types of Joints
The place where bones meet are called joints
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Human Elbow Structure and Function
Articulate joints OR synovial joints have similar structure. This includes muscles and bones on either side of a joint and in between where the bones meet contains three things:
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Antagonistic Muscles (in insects)
Skeletal muscles are antagonistic to each other. This means that movement requires two sets of muscles. These pairs of muscles are called antagonistic pairs.
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The Physics of movement
Bones and exoskeletons provide anchorage for muscles and act as levers
Understanding physics of basic machines consisting of a
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Types of Muscles
Three types of mucles are present:
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Skeletal Muscle Fibers
Striated (Skeletal) muscle is composed of bundles called muscle fibers.
Muscle Fibers are:
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The Sarcomere
Muscle fibers contain myofibrils
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How muscle contraction works
Myosin (thick filament)
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Myosin filaments contain “heads” that bind to specialized binding sites on the actin filaments. Attachment of heads to actin called a Cross-bridge. Many cross-bridges are formed at one time during this action:
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Control of Muscle Contraction
Calcium controls contraction
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