Sliding filament theory | Wikipedia audio article
Channel: wikipedia tts
Date: 2019-02-18

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Sliding_filament_theory


00:02:09 1 History
00:02:18 1.1 Early works
00:05:08 1.2 Origin of the sliding filament theory
00:09:40 2 The sliding filament theory
00:10:19 2.1 Huxley-Niedergerke hypothesis
00:11:13 2.2 Huxley-Hanson hypothesis
00:13:18 3 Reception and consequences
00:15:43 3.1 Cross-bridge mechanism



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SUMMARY
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The sliding filament theory explains the mechanism of muscle contraction based on muscle proteins that slide past each other to generate movement. It was independently introduced in 1954 by two research teams, one consisting of Andrew F. Huxley and Rolf Niedergerke from the University of Cambridge, and the other consisting of Hugh Huxley and Jean Hanson from the Massachusetts Institute of Technology. It was originally conceived by Hugh Huxley in 1953. Andrew Huxley and Niedergerke introduced it as a "very attractive" hypothesis.According to the sliding filament theory, the myosin (thick) filaments of muscle fibers slide past the actin (thin) filaments during muscle contraction, while the two groups of filaments remain at relatively constant length. Before the 1950s there were several competing theories on muscle contraction, including electrical attraction, protein folding, and protein modification. The novel theory directly introduced a new concept called cross-bridge theory (classically swinging cross-bridge, now mostly referred to as cross-bridge cycle) which explains the molecular mechanism of sliding filament. Cross-bridge theory states that actin and myosin form a protein complex (classically called actomyosin) by attachment of myosin head on the actin filament, thereby forming a sort of cross-bridge between the two filaments. These two complementary hypotheses turned out to be the correct description, and became a universally accepted explanation of the mechanism of muscle movement.