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muscular system
| Question | Answer |
|---|---|
| Muscle filament that is thin and knobby | actin |
| muscle filament that is thick and had heads on it | myosin |
| what causes muscle striations | the fact that actin and myosin are different densities actin is thin and myosin is thick |
| what makes dark striations and light striations | dark- both myosin and actin light- just actin |
| what 3 ions are involved in muscle contraction/relaxation | Na, K, Ca |
| ADP is used during what part of movement | for contraction. ATP used for relaxation |
| what is the neurotransmitter used to innervate muscles | acetylcholine |
| M-line on myofibril | the middle of the myosin, in the middle of the h-zone, in the middle of the sarcomere |
| I-band | where sarcomeres meet up, zone of pure actin |
| Z-line | the boundary between 2 sarcomeres |
| A-band | the dark band in the center of a sarcomere that contains the thick myosin filaments and the overlapping portions of the thin actin filaments. Both actin and myosin |
| H-band | the center of the sarcomere that is just myosin. in the middle in the m-line |
| what is the covering of the largest muscle structure | epimysium |
Created by:
user-1989152