vázizomsejtekben
Vázizomsejtekben, more commonly known as skeletal muscle cells or muscle fibers, are specialized cells that constitute the skeletal muscles of the body. These cells are multinucleated, meaning they contain multiple nuclei within a single cell membrane. This characteristic arises from the fusion of numerous precursor cells, known as myoblasts, during muscle development. The cytoplasm of a skeletal muscle cell is packed with myofibrils, which are long, cylindrical structures composed of repeating units called sarcomeres. These sarcomeres are the fundamental contractile units of the muscle cell and are responsible for the generation of force.
The structure of myofibrils is defined by the arrangement of two main protein filaments: actin and myosin.
Skeletal muscle cells are also characterized by their extensive sarcoplasmic reticulum, a specialized form of endoplasmic