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FQ 21-30
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Savannah Mhonda
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Cards (16)
What do the dark bands in skeletal muscle contain?
Myosin filaments
and overlapping
actin
ends
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Why are dark bands called I bands?
They are
anisotropic
to polarized light
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How many myofibrils does each muscle fiber contain?
Several hundred to
several
thousand
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How many actin and myosin filaments are in each myofibril?
About
1500
actin and
3000
myosin filaments
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What do the light bands in skeletal muscle contain?
Only
actin filaments
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Why are light bands called I bands?
They are
anisotropic
to
polarized
light
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What is the diameter range of skeletal muscle fibers?
10
to
80
micrometers
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What does the Z disc do in skeletal muscle?
Attaches
myofibrils
across the muscle fiber
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What is the molecular weight of the titin molecule?
About 3
kDa
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What role does titin play in skeletal muscle?
Sustains
myosin
and
actin
filaments in place
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What is the length of the sarcomere when contracted?
About 2
micrometers
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What happens to actin filaments during muscle contraction?
They completely overlap the
myosin filaments
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What is present in the sarcoplasm of muscle fibers?
Tremendous numbers of
mitochondria
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What is the function of mitochondria in muscle fibers?
Supply energy in the form of
ATP
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How do mitochondria align in muscle fibers?
They lie parallel to the
myofibrils
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What energy form do mitochondria supply to contracting myofibrils?
Adenosine diphosphate
(ADP)
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