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26 Cards in this Set
- Front
- Back
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What is the term used to define the scientific study of muscles?
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Myology
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Describe the point of origin
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The place where the bone is not moving
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Define the point of insertion
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The place where the bone is moving
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What convey impulses for muscular contraction?
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Nerves
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What provides nutrients and oxygen for contraction?
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Blood
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What are the units that muscle fibers are made up of?
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filaments
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What are the two types of filaments?
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thick and thin
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What is the correct name for thick filaments?
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Myosin
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What is the correct name for thin filaments?
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Actin
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Define satellite cells in the muscle
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immature muscle cells (fibers)
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Are muscle cells uninucleated or multinucleated?
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multinucleated
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Define Titinfilament
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spring that connects thick myosin filaments to Z discs in the sarcomere.
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Define "m" line
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Middle line created by myomesin
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Define "z" discs
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a cross-striation bisecting the I band of striated muscle myofibrils and serving as the anchoring point of actin filaments at either end of the sarcomere.
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Define Sarcomere
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The functional unit of a muscle fiber that extends from one z disc to another z disc.
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Which filament(s) does the I band contain?
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Only actin
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Which filament(s) does the H band contain?
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Only myosin
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Which Filament(s) does the A band contain?
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Both actin and myosin
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Which band contains the heads of the myosin?
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the A band
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What are the 3 kinds of protein myofibrils are made up of?
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1-contractile proteins
2-regulatory proteins 3-structural proteins |
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What are contractile proteins made up of?
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actin and myosin
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What are regulatory proteins made up of?
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troponin and tropomyosin
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What are structural proteins made up of?
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titin, myomsein, nebulin, and dystrophin
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Which protein filament converts ATP to mechanical energy?
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myosin
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Which protein filament vlocks myosin binding sites in action?
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tropomyosin
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What protein filament holds tropomyosin in place?
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Troponin
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