Chapter 12
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16 terms
Terms | Definitions |
|---|---|
 Skeletal Muscles | are connected to at least two bones |
| Tendons | Cords of elastic connective tissue that transmit force from the muscle to the bone |
| Fascicles | bundles of individual muscle cells, connective tissue, blood vessels, and nerves |
| Muscle fibers | Muscles cells |
| Sarcolemma | muscle fiber's plasma membrane |
| Myofibrils | rodlike elements which contain the fiber's contractile machinery |
| Sarcoplasmic Reticulum | Saclike membranous network which surrounds each of the myofibrils and is closely associated transverse tubules |
| Transverse Tubules | are connected to the sarcolemma and penetrate into the cell's interior |
| Sarcomere | the fundamental unit that repeats over and over |
| A Band | The dark striation observed under the microscope that is due to the presence of think filaments |
| H Zone | No thin filaments overlapping the think filaments |
| I Band | Areas where there are thin filaments with no overlap with thick filaments |
| Tropomyosin | a long fibrous molecule that extends over numerous actin monomers in such a way that it blocks the myosin-binding sites in muscles at rest |
| Troponin | a complex of three proteins-actin strand, binds to tropomyosin, and calcium ions can bind reversibly |
| Crossbridges | bridge the gap between the thick and thin filaments |
| Crossbridge Cycle | The mechanism that drives the sliding of thick and think filaments past one another |
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