Plasma Membrane Of Skeletal Muscle
| Sarcolemma | |
|---|---|
 Skeletal musculus fiber, with sarcolemma labeled at upper left. | |
| Details | |
| Location | Striated muscle tissue |
| Office | Prison cell membrane |
| Identifiers | |
| MeSH | D012508 |
| TH | H2.00.05.0.00003 |
| Anatomical terminology [edit on Wikidata] | |
The sarcolemma (sarco (from sarx) from Greek; flesh, and lemma from Greek; sheath) too called the myolemma, is the cell membrane surrounding a skeletal musculus cobweb or a cardiomyocyte.[i] [2] Information technology consists of a lipid bilayer and a sparse outer glaze of polysaccharide material (glycocalyx) that contacts the basement membrane. The basement membrane contains numerous thin collagen fibrils and specialized proteins such as laminin[3] that provide a scaffold to which the muscle fiber can adhere. Through transmembrane proteins in the plasma membrane, the actin skeleton inside the jail cell is connected to the basement membrane and the cell'south exterior. At each end of the muscle fiber, the surface layer of the sarcolemma fuses with a tendon cobweb, and the tendon fibers, in turn, collect into bundles to form the musculus tendons that attach to bones.
The sarcolemma more often than not maintains the same function in muscle cells as the plasma membrane does in other eukaryote cells.[iv] It acts every bit a barrier between the extracellular and intracellular compartments, defining the individual muscle cobweb from its surroundings. The lipid nature of the membrane allows it to separate the fluids of the intra- and extracellular compartments, since it is simply selectively permeable to water through aquaporin channels. As in other cells, this allows for the compositions of the compartments to exist controlled by selective send through the membrane. Membrane proteins, such as ion pumps, may create ion gradients with the consumption of ATP, that may later be used to bulldoze ship of other substances through the membrane (co-transport) or generate electric impulses such as action potentials.
A special characteristic of the sarcolemma is that it invaginates into the sarcoplasm of the muscle jail cell, forming membranous tubules radially and longitudinally inside the fiber called T-tubules or transverse tubules. On either side of the transverse tubules are terminal cisternal enlargements of the sarcoplasmic reticulum (termed endoplasmic reticulum in nonmuscle cells). A transverse tubule surrounded past two SR cisternae are known as a triad, and the contact between these structures is located at the junction of the A and I bands.
References [edit]
- ^ Sarcolemma at the US National Library of Medicine Medical Subject Headings (MeSH)
- ^ Ripa, Rashelle; George, Tom; Sattar, Yasar (2022). "Physiology, Cardiac Muscle". StatPearls. StatPearls Publishing. Retrieved four September 2022.
- ^ Engvall, E.; Earwicker D; Haaparanta T; Ruoslahti E; Sanes JR. (September 1990). "Distribution and isolation of four laminin variants; tissue restricted distribution of heterotrimers assembled from v dissimilar subunits". Prison cell Regulation. 1 (10): 731–twoscore. doi:x.1091/mbc.1.10.731. PMC361653. PMID 2099832.
- ^ Boron, Walter F. (2009). Medical Physiology 2nd edition. Philadelphia: Saunders. pp. ix–21.
Plasma Membrane Of Skeletal Muscle,
Source: https://en.wikipedia.org/wiki/Sarcolemma
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