Chapter 7: The Muscular System -Microscopic anatomy of skeleta muscle cells (myofibers):
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22 terms
Terms | Definitions |
|---|---|
 long cylindrical cell, 100um in length | Describe the microscopic anatomy of skeletal muscle cells (myofibers): General size and shape |
| found at periphery of cell and next to sarcolemma | Describe the microscopic anatomy of skeletal muscle cells (myofibers): nuclei |
| plasma membrane of muscle cell | Describe the microscopic anatomy of skeletal muscle cells (myofibers): sarcolemma |
| cytoplasm of muscle fiber | Describe the microscopic anatomy of skeletal muscle cells (myofibers): sarcoplasma |
| oxygen binding protein in muscle fibers (oxygen stores) | Describe the microscopic anatomy of skeletal muscle cells (myofibers): myoglobin |
| myofibers appear striated or striped due to the presence of I light bands where the thin filaments are located and A dark bands where they are thick and thin filaments | Describe the microscopic anatomy of skeletal muscle cells (myofibers): striations |
| functional contractile unit of myofibril; one sarcomere consists of the filaments extending btwn Z discs | Describe the microscopic anatomy of skeletal muscle cells (myofibers): sarcomere |
| (Z-disc) dense region separating sarcomeres | Describe the microscopic anatomy of skeletal muscle cells (myofibers): Z-lines |
| the smaller structures (filaments) that make up the myofibril | Describe the microscopic anatomy of skeletal muscle cells (myofibers): Myofilaments |
| thin filaments, thick filaments, elastic filaments | What are the three types of myofilaments making up skeletal muscle? |
| diameter 8nm, composed of actin | Define the thin filaments of skeletal muscle? |
| diameter 16nm, composed of myosin | Define the thick filaments of skeletal muscle? |
| composed of titin, anchors thick filaments to Z discs to stabilize the relaxed state of the sarcomere. | Define the elastic filaments of skeletal muscle? |
| troponin and tropomyosin | Describe the microscopic anatomy of skeletal muscle cells (myofibers): Regulatory proteins |
| contractile protein in thick filament, shaped like two golf clubs twisted together | Describe the microscopic anatomy of skeletal muscle cells (myofibers): Myosin |
| myosin head that extends to the thin filaments (head of golf club) | Describe the microscopic anatomy of skeletal muscle cells (myofibers): crossbridge |
| contractile protein in thin filament, globular actin molecules join to form a helix | Describe the microscopic anatomy of skeletal muscle cells (myofibers): actin |
| regulatory protein on thin filament | Describe the microscopic anatomy of skeletal muscle cells (myofibers): tropomyosin |
| regulatory protein on thin filament | Describe the microscopic anatomy of skeletal muscle cells (myofibers): troponin |
| are located on each actin molecule so actin can interact with myosin during contraction | Describe the microscopic anatomy of skeletal muscle cells (myofibers): myosin binding sites |
| stores Ca2+ | Describe the microscopic anatomy of skeletal muscle cells (myofibers): Sarcoplasmic reticulum |
| carry nerve stimulus (action potential) from outside of deep fiber into the muscle cell | Describe the microscopic anatomy of skeletal muscle cells (myofibers): Transverse tubules |
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