Ch. 10 Muscular Tissue Quiz 2
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31 terms
Terms | Definitions |
|---|---|
 Titin | Type of structural protein that stabilizes the position of myosin |
| Regulatory | Category of proteins that switches the contraction process on and off |
| action potentials | What causes the release of calcium from the SR into the muscle cell |
| Dystrophin | Type of protein that links the thin filaments to the sarcolemma |
| Contractile | Category of proteins that generates the force during contraction |
| Length | The forcefulness of a muscle contraction depends on the ____ of the sarcomere |
| Actin | Type of protein that provides a site where a myosin head can attach |
| Actin/ Thin | During the sliding filament mechanism which filament is pulled toward the center |
| Myosin | Which type of contractile protein converts ATP to energy of motion |
| Structural | Category of proteins that aligns the thick and thin filaments properly |
| calcium | Which ion is most important in starting the contraction of the muscle |
| ATP Hydrolysis/ Formation of cross Bridges/ Power Stroke/ Detachment of myosin from Actin | List the four steps of the contraction cycle (In order) |
| Z discs | seperate one sarcomere from the next |
| A band | middle part of sarcomere where thick and thin filaments overlap one another |
| I band | lighter part of a sarcomere, contains thin but no thick filaments |
| H zone | center of each A band which contains thick but not thin filaments |
| M line | supporting proteins that hold the thick filaments together in the H zone |
| muscle proteins | what are myofibrils built from |
| troponin, tropomyosin | two types of regulatory proteins |
| myosin, actin | two types of contractile proteins |
| titin, dystrophin | two types of structural proteins |
| sliding filament mechanism | myosin heads attach to and walk along thin filaments at both ends of a sarcomere |
| shortens | what happens to the sarcomere and muscle after the sliding filament mechanism? |
| contraction cycle | the onset of contraction begins with the SR releasing calcium ions into the muscle cell, where they bind to actin opening the myosin binding sites |
| ATP hydrolysis | step where hydrolosis of ATP reorients and energizes the myosin head |
| formation of cross-bridges | step where myosin head attaches to the myosin-binding site on actin |
| power stroke | step when the crossbridge rotates, sliding the filaments |
| detachment of myosin from actin | step when as the next ATP binds to the myosin head, the hyosin head detaches from actin |
| ATP, Ca++ | the contraction cycle repeats as long as what two things are available? |
| Ca++ pumps | the muscle cell membrane contains what that return Ca++ back to the SR quickly? |
| relaxes | what happens to the muscle as the Ca++ level in the cell drops? |
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