Components of voluntary muscle

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define: muscle fibre
a muscle cell
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define: sarcolemma
plasma membrane of a muscle fibre (muscle cell)
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define: sacroplasm
cytoplasm of a muscle fibre (muscle cell)
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define: sacroplasmic reticulum
specialised ER in a muscle fibre (muscle cell)
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define: innervation
stimulation of a muscle cell by a motor neurone
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define: motor unit
a cluster of muscle cells/fibres
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define: motor end plate
the flattened end of a motor neurone that transmits impulses to a muscle
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Q: ______ motor neurones can stimulate _______ muscle
A: MANY motor neurones can stimulate ONE muscle
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Q: _____ neurone can innervate ______ muscle cell
A: ONE neurpne can innervate ONE muscle cell
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Q: the function of branching motor neurones
A: many neuromuscular junctions / one neurone can cause contraction of a whole motor unit (cluster of muscle cells)
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Define: gradation of response
the more motor units stimulated the greater the force of contraction
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Q: Fine movements are controlled by ____ motor units consisting of a _____ of cells in each motor unit
A: Fine movements are controlled by MANY motor units consisting of a FEW of cells in each motor unit
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define: actin
a protein found in muscle cells / the main component of thin filaments
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define: myosin
protein found in muscle cells / the main componet of thick filaments / has heads which form cross bridges associated with muscle contraction
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Q: myofilaments found in voluntary muscle
actin and myosin
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A: name of thick filament in voluntary muscle
A: Myosin
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A: name of thin filament in voluntary muscle
A: actin
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Define: myofibrils
organelles consisting of bundles of myofilaments (action and myosin)
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Q: the line in the MIDDLE of the DARK band of the myofibril
M line
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Q: the line in the MIDDLE of the LIGHT band of the myofibril
Z line
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Q: where is the sarcomere on a myofibril
from Z line to Z line
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Q: structure of myosin
thick filament / myosin heads which form cross bridges
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Q: structure of actin
thin filament / globular protein / double helix chain / at each twist there is a binding site for myosin head / tropomyosin covers this during relaxation
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Q: function of tripomyosin
part of actin which covers the binding site for myosin during relaxation
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Other cards in this set

Card 2

Front

define: sarcolemma

Back

plasma membrane of a muscle fibre (muscle cell)

Card 3

Front

define: sacroplasm

Back

Preview of the front of card 3

Card 4

Front

define: sacroplasmic reticulum

Back

Preview of the front of card 4

Card 5

Front

define: innervation

Back

Preview of the front of card 5
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