The number of myofibrils within the enlarged muscle fiber can increase more than 10-fold. |
Briefly, the cardiac myofibrils are composed of the major contractile proteins, actin and myosin. |
Fast-acting muscles have highly ordered structure due to the closely interrelated disposition of membranes and myofibrils. |
In cross section, skeletal muscle fibers are seen to be composed of numerous small aggregates of contractile substance, the myofibrils. |
Within the sarcolemma is the sarcoplasm, containing all the usual subcellular elements plus long prominent myofibrils. |
Individual muscle cells are extremely elongated and enclose many-stranded cables woven from threads called myofibrils. |