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What are the 4 basic properties of all muscle tissue (skeletal, cardiac, and smooth)?
- -contractility
- -excitability
- -extensibility
- -elasticity
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What are the 5 basic functions of a skeletal muscle?
- -movement
- -posture
- -support
- -regulate flow
- -maintain temperature
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What layer of connective tissue surrounds the entire muscle?
epimysium
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What layer of connective tissue divides the muscle into a series of internal compartments containing a bundle of muscle fibers and contains blood vessels and nerves that branch to supply each bundle of fibers?
perimysium
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What is the technical term for a bundle of muscle fibers?
Fasicle
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What layer of connective tissue surrounds each muscle fiber, binds each fiber to its neighbor, and supports capillaries that supply blood to individual muscle fibers?
endomysium
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What do we call a thick cord or cable formed from the convergence of the connective tissue layers of a muscle that bind the muscle to bone, skin, or another muscle?
tendon
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What do we call a convergence of connective tissue layers if it takes the form of a flattened sheet rather than a cord/cable?
Apo neurosis
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What do we call the site of chemical communication between a nerve and a skeletal fiber?
neuromuscular junction
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What is the technical term for the plasma membrane of a skeletal muscle cell?
sarcolemma
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What is the name of the deep indentations of the skeletal muscle cell's plasma membrane that extend into the cytoplasm and carries electrical impulses that stimulate and coordinate muscle contractions?
t-tubules
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What is the technical term for the structures, composed of bundles of protein filaments, that can shorten are therefore responsible for muscle contraction?
myofibrils
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What is the name of the repeating unit of protein fibers in an myofibril?
sarcomere
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what protein is found in the THICK filaments of a myofibril?
myosin
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What protein is found in the THIN filaments of a myofibril?
actin
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At what region do proteins bind thick filaments at the center of the sarcomere?
M-line
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At what region do proteins bind thin filaments at the ends of the sarcomere?
z-line
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What region of the sarcomere contains only thick filaments (including the m-line)?
H-band
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What region of the sarcomere contains only thin filaments (continuous between sarcomeres and includes the z-line)?
I-band
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What region of the sarcomere consists of the entire region with thick filaments (both overlapping thick and thin filaments and only thick filaments)?
A-band
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What do we call all of the muscle fibers controlled by a single motor neuron?
motor unit
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What does the size of the motor unit (# of muscle fibers) tell us?
Fewer myofibrils per neuron= greater control
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What type of muscle fibers are smaller in diameter, contain densely packed myofibrils, have large glycogen reserves, have a few mitochondria, and are prone to fatigue?
Fast fibers
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What type of muscle fibers are smaller in diameter, have an extensive capillary network, contain myoglobin (stores oxygen), and have many mitochondria?
Slow fibers
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What do we call the attachment site of a muscle that (generally) remains stationary?
Origin
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What do we call the attachment site of a muscle that moves during contraction?
insertion
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What do we call a muscle whose contraction is mostly responsible for producing a movement?
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What do we call a muscle that assists the primary muscle in performing a movement?
Synergist
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What do we call a muscle whose actions oppose those of another muscle?
Antagonist
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