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29 Cards in this Set
- Front
- Back
What are the 4 basic properties of all muscle
tissue (skeletal, cardiac, and smooth)? |
Excitability
Contractility Extensibility Elasticity |
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What are the 5 basic functions of skeletal
muscle? |
*Movement (skeletal)
*Posture (maintain it) *Support (soft tissues, e.g. abdomen) *Regulate flow (sphincters) *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 each of these
bundles of fibers Perimysium? |
Fascicle
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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 this convergence of
connective tissue layers if it takes the form of a flattened sheet? |
Aponeurosis
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What do we call the site of chemical
communication between a nerve and a skeletal muscle 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 a 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 large in
diameter, contain densely packed myofibrils, have large glycogen reserves, have 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? |
*Agonist
*Prime Mover |
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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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