It has something to do with a sliding interaction between actin and myosin. In 1954, scientists published two groundbreaking papers describing the molecular basis of muscle contraction.

Methods: Serum samples were obtained from 33 healthy controls and 33 patients with severe skeletal muscle damage, defined by a total creatine kinase value of >500 IU/l (Rosalki method). Troponin I, ...

The extracellular matrix protein fibronectin forms fibrils when in association with ... including the giant muscle protein titin, receptor tyrosine kinases, phosphatases, collagens and tenascin.