Skeletal muscle, with myofibrils labeled at upper right.
Details
Identifiers
Latin
myofibrilla
MeSH
D009210
TH
H2.00.05.0.00007
Anatomical terms of microanatomy
[edit on Wikidata]
A myofibril (also known as a muscle fibril or sarcostyle)[1] is a basic rod-like organelle of a muscle cell.[2] Skeletal muscles are composed of long, tubular cells known as muscle fibers, and these cells contain many chains of myofibrils.[3] Each myofibril has a diameter of 1–2 micrometres.[3] They are created during embryonic development in a process known as myogenesis.
Myofibrils are composed of long proteins including actin, myosin, and titin, and other proteins that hold them together. These proteins are organized into thick, thin, and elastic myofilaments, which repeat along the length of the myofibril in sections or units of contraction called sarcomeres. Muscles contract by sliding the thick myosin, and thin actin myofilaments along each other.
^"Definition of SARCOSTYLE". www.merriam-webster.com.
^McCracken, Thomas (1999). New Atlas of Human Anatomy. China: Metro Books. pp. 1–120. ISBN 1-5866-3097-0.
^ abAlberts, Bruce (2015). Molecular biology of the cell (Sixth ed.). New York, NY. pp. 918–921. ISBN 9780815344643.{{cite book}}: CS1 maint: location missing publisher (link)
A myofibril (also known as a muscle fibril or sarcostyle) is a basic rod-like organelle of a muscle cell. Skeletal muscles are composed of long, tubular...
storage; and myofibrillar hypertrophy, which focuses more on increased myofibril size. It is the primary focus of bodybuilding-related activities. A range...
myogenesis. Skeletal muscle cells and cardiac muscle cells both contain myofibrils and sarcomeres and form a striated muscle tissue. Cardiac muscle cells...
during embryonic myogenesis. Muscle fibers contain numerous tubular myofibrils. Myofibrils are composed of repeating sections of sarcomeres, which appear under...
mitochondria to meet energy needs. Muscle fibers are in turn composed of myofibrils. The myofibrils are composed of actin and myosin filaments called myofilaments...
electrically excitable cells. They are larger than cardiomyocytes with fewer myofibrils and many mitochondria. They conduct cardiac action potentials more quickly...
They are generally much smaller than the contractile cells and have few myofibrils which gives them limited contractibility. Their function is similar in...
facilitates transport of high energy phosphate from muscle cell mitochondria to myofibrils. This is part of phosphocreatine metabolism. In mitochondria, Adenosine...
sensitizes and increases the binding efficiency of cardiac troponin in the myofibril to the calcium ions that are already present in systole. In normal hearts...
chains of the motor-protein myosin. Together, these two filaments form myofibrils - the basic functional organelles in the skeletal muscle system. In vertebrates...
Skeletal striated muscle tissue is arranged in regular, parallel bundles of myofibrils, which contain many contractile units known as sarcomeres, which give...
action potential which induces muscle contraction. Labels: A: Motor neuron axon B: Axon terminal C: Synaptic cleft D: Muscle cell E: Part of a Myofibril...
Myofilaments are the three protein filaments of myofibrils in muscle cells. The main proteins involved are myosin, actin, and titin. Myosin and actin are...
unit of a muscle fiber is called a sarcomere. Each muscle cell contains myofibrils composed of actin and myosin myofilaments repeated as a sarcomere. Many...
muscle cells, called muscle fibers, which are in turn composed of myofibrils. Myofibrils are composed of sarcomeres, the basic building blocks of striated...
prominence seen against the disc of the sun Myofilament, filaments of myofibrils constructed from proteins Protein filament, a long chain of protein subunits...
near the periphery of the cells allows maximal intracellular space for myofibrils. Other multinucleate cells in the human are osteoclasts a type of bone...
also aids in pH and ion balance within muscle cells. It contains mostly myofibrils (which are composed of sarcomeres), but its contents are otherwise comparable...
cells: (a) the small, round P cells which have very few organelles and myofibrils, and (b) the slender elongated transitional cells, which are intermediate...
downstream cellular processes. The mitochondria can be found nestled between myofibrils of muscle or wrapped around the sperm flagellum. Often, they form a complex...
entheogens, as well as their dangers, such as poisoning or infection. myofibril A basic rod-like unit of a muscle cell. myosin A superfamily of motor...
are most likely due to hemorrhagic shock, but they also can be due to myofibril degeneration, mitochondrial swelling, and pericardial and subendocardial...
their ends by intercalated discs to form long fibers. Each cell contains myofibrils, specialized protein contractile fibers of actin and myosin that slide...
shed light on the function, in stretching, of a large protein within the myofibrils of skeletal muscles named titin. A study performed by Magid and Law demonstrated...
composed of 65% myofibril, 23.5% mitochondria and 9.6% sarcoplasmic reticulum. Although synchronous muscle has a higher percentage of myofibril, the cross-sectional...
reticulum. The Ca2+ then diffuses out of the sarcoplasmic reticulum to the myofibrils so it can stimulate contraction. The endplate potential is thus responsible...
thousands of times shorter than a skeletal muscle cell. There are no myofibrils present but much of the cytoplasm is taken up by the proteins of myosin...
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