Microscopic Anatomy of Skeletal Muscle Crossword
                                
                                
                                
                                
                                
                                
                                
                                
                                
                                
                                
                                
                                
                                
                                
                                
                                
                                
                                
 
 
Down: 1) Contractile organelles of the muscle fiber. 3) Overlapping compartments that thick and thin filaments are arranged in. 4) Made up of proteins - actin, tropomyosin and troponin, lies both in A and I band and bisected by a proteinacious line called Z-line.6) Plasma membrane of the muscle fiber.7) The filaments of myofibrils, constructed from proteins, principally myosin or actin.10) individual molecules join to form a thin filament that forms a double helix; each molecule has a myosin-binding site where a myosin head can attach. Across: 2) A motor molecule that works to move the cell.5) A specialized type of smooth ER that regulates the calcium ion concentration in the cytoplasm of striated muscle cells.8) Energized myosin head attaches to an actin myofilament.9) One of the two types of protein filaments that, together form cylindrical structures call myofibrils which extend along the length of muscle fibres.11) A synthetic steroid hormone that resembles testosterone in promoting the growth of muscle.
 

 

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