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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. [1] 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 ...
Depiction of smooth muscle contraction. Muscle contraction is the activation of tension-generating sites within muscle cells. [1] [2] In physiology, muscle contraction does not necessarily mean muscle shortening because muscle tension can be produced without changes in muscle length, such as when holding something heavy in the same position. [1]
Sliding filament model of muscle contraction. Cardiac sarcomere structure featuring myosin. Myosin II (also known as conventional myosin) is the myosin type responsible for producing muscle contraction in muscle cells in most animal cell types. It is also found in non-muscle cells in contractile bundles called stress fibers. [18]
7134 21924 Ensembl ENSG00000114854 ENSMUSG00000091898 UniProt P63316 P19123 RefSeq (mRNA) NM_003280 NM_009393 RefSeq (protein) NP_003271 NP_033419 Location (UCSC) Chr 3: 52.45 – 52.45 Mb Chr 14: 30.93 – 30.93 Mb PubMed search Wikidata View/Edit Human View/Edit Mouse Troponin C, also known as TN-C or TnC, is a protein that resides in the troponin complex on actin thin filaments of striated ...
Diagram of skeletal muscle fiber structure. Skeletal muscle cells are the individual contractile cells within a muscle and are more usually known as muscle fibers because of their longer threadlike appearance. [10] Broadly there are two types of muscle fiber performing in muscle contraction, either as slow twitch or fast twitch .
An impulse from a nerve cell causes calcium release and brings about a single, short muscle contraction called a muscle twitch. If there is a problem at the neuromuscular junction, a very prolonged contraction may occur, such as the muscle contractions that result from tetanus. Also, a loss of function at the junction can produce paralysis. [5]
This ring, aptly called the "contractile ring", uses a similar mechanism as muscle fibers where myosin II pulls along the actin ring, causing it to contract. [66] This contraction cleaves the parent cell into two, completing cytokinesis. [66] The contractile ring is composed of actin, myosin, anillin, and α-actinin. [67]
Smooth muscle contraction is caused by the sliding of myosin and actin filaments (a sliding filament mechanism) over each other. The energy for this to happen is provided by the hydrolysis of ATP. Myosin functions as an ATPase utilizing ATP to produce a molecular conformational change of part of the myosin and produces movement.