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| 5373979145 | Muscle | easy | 0 | |
| 5373979146 | Fasica | dense connective tissue | 1 | |
| 5373979983 | muscle fiber | A muscle cell. It contains multiple nuclei. | 2 | |
| 5373979984 | sarcolemma | tubular sheath that envelops the fibers of skeletal muscles. | 3 | |
| 5373980708 | muscle fibril | is a basic rod-like unit of a muscle cell. | 4 | |
| 5373981670 | sarcoplasmic reticulum | regulates the calcium ion concentration in the cytoplasm of striated muscle cells. | 5 | |
| 5373983369 | muscle filaments | 6 | ||
| 5373985091 | sacomere | The smallest functional unit of a muscle cell. In other words, the smallest unit that con contract | 7 | |
| 5373985092 | Voluntary | move at will | 8 | |
| 5373985811 | Involuntary | cannot move at will | 9 | |
| 5373985812 | Straited | muscle tissue in which the contractile fibrils in the cells are aligned in parallel bundles, so that their different regions form stripes visible in a microscope | 10 | |
| 5373986817 | contraction | shortening of muscle | 11 | |
| 5373986818 | Relaxation | lengthening of muscle | 12 |