Muscle Functions Of Muscle Function
Smooth muscle Functiohs one of three types of muscle tissue, alongside cardiac and skeletal muscle. It is a non-striated muscle tissue, lacking the characteristic markings of the other muscle types. It is found in numerous bodily systems, including the ophthalmic, reproductive, respiratory and gastrointestinal systems, where it functions to contract and cause movements under involuntary control.
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This article will discuss the ultrastructure of smooth muscle, its mode of contraction and function in the human body. Smooth muscle fibres are elongated and spindle-shaped cells which taper at both ends. This distinctive shape, along with the presence of a single central nucleushelps to identify it histologically. These fibres are thousands of times shorter than skeletal muscle fibres.
Skeletal Muscles
Smooth muscle differs from striated muscle in many ways. T-tubules, myofibrils and sarcomeres are all absentin contrast to striated muscle. Actin and myosin contractile proteins, as are thick and thin filaments. However, these are arranged differently.
Thin filaments are attached to a dense body analogous to the Z-disc of skeletal and cardiac muscle. As smooth muscle cells lack troponin, cross-bridge formation is not regulated Mucle the troponin-tropomyosin complex as it is in skeletal muscle. Instead, https://amazonia.fiocruz.br/scdp/blog/woman-in-black-character-quotes/the-great-gatsby-narrator-analysis.php formation is regulated by the action of calcium-modulated protein, more commonly known as calmodulin.
The process is as follows:. Relaxation of smooth muscle requires the myosin head to become dephosphorylated, which is mediated by myosin light chain phosphatase.]
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