Body Structure and Function - Muscular System PT2 -
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| describe the size of muscle fibres | larger than other cells and can be length of entire muscle
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| name structures of muscle fibre | sacrolemma
transverse (T) tubules
sacroplasmic recticulum
myofibrils
sacromeres
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| muscle fibre plasma membrane? | sacrolemma
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| sacrolemma? | muscle fibre plasma membrane
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| what does the sacrolemma surround? | sacroplasm
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| sacrolemma is studded with? | T tubules
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| T tubules connect what? | sacrolemma to contractile parts of cell
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| T tubules contain what? | extracellular fluid
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| T tubules are important for what? | coordinated contraction of entire cell
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| what are myofibrils made of? | contractile myofilaments of actin and myosin
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| what are myofibrils surrounded by | T tubules and sacroplasmic recticulum
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| what do myofibrils connect to | sacrolemma at both ends of muscle fibre
so contraction shortens whole cell
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| where do glycogen granules and mitochondria sit? | sacroplasm adjacent to myofibrils to provide ATP for contraction
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| why do glycogen granules and mitochondria sit in the sacroplasm adjacent to myofibrils | to provide ATP for contraction
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| what sits in the sacroplasm adjacent to myofibrils to provide ATP for contraction | mitochondria and glycogen grandules
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| TC? | terminal cisternae
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| TC contain high conc of? | Ca2+
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| why is a high conc of Ca2+ needed in TC? | for contraction
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| triad? | 2x TCs and a T tubule
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| 2x TCs and T tubule? | triad
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| sacroplasmic recticulum is important why? | Ca2+ prevented from being pumped out the cell?
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| sacromeres? | repeating unit of myofibrils
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| alternating patterns of light and dark are created by what in sacromeres? | density differences
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| alternating patters of what are creates by density differences in sacromeres? | light and dark
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