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32 Cards in this Set
- Front
- Back
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what muscle types are striated?
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skeletal
cardiac |
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what mesenchymal cells do muscles develop from?
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myoblasts
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what determines the a sarcomere histologically?
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distance from one Z band to another
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muscle fibers that do not have much mitochondria or myoglobin?
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White fibers (fast twitch)
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muscle fibers that contain many mitochondria and myoglobin
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Red fibers
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actomyosin is composed of what proteins
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myosin + actin
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When _______ is exposed to a protease it cleaves to give ______ and _________
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myosin
light meromyosin heavy meromyosin |
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Which of the myosin subcomponents is a ATPase?
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heavy meromyosin
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If skeletal muscle is stretched what are the effects on the :
H band A band M line |
H band increases
A band does not move M line unchanged |
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in skeletal muscle what is deemed as the smooth endoplasmic reticulum and what is its function?
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sarcoplasmic reticulum : SR
release and sequestering of Ca++ |
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what protein is found directly upon actin?
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Tropomyosin
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what protein is found directly upon Tropomyosin?
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Troponin
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What protein fastens thin filaments of actin to the Z bands in a sarcomere?
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Alpha actin
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where are T tubules found for carrying deep depolarization during contraction?
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between A and I bands
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what is a 'Triad' referring to?
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2 SR
1 T Tubule |
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What hormone is responsible for creating muscle ? and what muscle fiber particularly?
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Testosterone
White fibers |
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What is the position of the nuclei in cardiac muscle and skeletal muscle?
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skeletal: peripheral
cardiac: central |
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what cells are responsible for regenerative function in _________ muscles
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satellite cells
skeletal |
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what is the 'wear and tear' pigment within cardiac muscle?
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Lipofuscin
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What to 'diads' refer to?
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Functional unit within cardiac muscle:
1 SR 1 T tubule |
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present in cardiac muscles in a longitudinal and transverse configuration that are a form of connection between cells
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Intercalated discs
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The transverse components that hold the cells together with desmosomes and zona adherens is referred to as?
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fascia adherens
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what feature enables cardiac tissue to perform in a 'functional syncitium'?
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gap junctions
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Where are T tubules located in cardiac muscle?
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@ Z line
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a protein called _____ ______ connects the thick filaments to each other from above and below creating the _____
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creatine phosphate
M line |
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When a sarcomere contracts:
H band - ? I band - ? |
H band narrows
I band narrows |
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where are the nuclei located in smooth muscles?
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centrally
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how do smooth muscle store and release calcium?
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vesicles
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what is the structure of the smooth muscle sarcomeres?
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they do not have these nor:
- striations - T tubules - SR |
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Which of the muscle cells is the strongest?
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smooth muscles
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Which muscle type can divide to form new cells when needed?
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smooth muscles
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what type of tissue surrounds muscle fibers, bundles, and the entire muscle itself?
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Dense Irregular CT
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