muscle - Definition. Was ist muscle
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Was (wer) ist muscle - definition

ONE OF THREE MAJOR MUSCLE TYPES
Skeletal muscles; Voluntary muscle; Musculo; Red skeletal muscle cell; White skeletal muscle cell; Muscle protein; Fast twitch muscle; Slow twitch muscles; Skeletal Muscle; Strongest muscle in human body; Muscle loss; Musculature; Muscle mass; Muscle, skeletal; Muscular branches; Muscle fibers, slow-twitch; Muscular diseases; Myoblasts, skeletal; Control of Muscles; Voluntary muscles; Characteristics of muscle; Muscular fiber; Skeletal muscular; Lean muscle; Muscles; Slow-twitch muscle; Panniculus carnosis; Neoplasms, muscle tissue; Excitation-contraction; Muscle proteins; Muscle strength; Muscle; Myoid cells; Branchialis; Connective tissue in skeletal muscle; Connective tissue of skeletal muscle; Muscle types; Convergent muscles; Human muscle; Fast-twitching; Textus muscularis striatus skeletalis; Skeletal muscle cells; Muscular; Gross anatomy of muscles; Muscular force; Myo-; Skeletal striated muscles; Fast twitch fibre; Slow twitch fibre; Slow twitch fiber; Fast twitch fiber; Skeletal striated muscle; Muscular fibers; Myonuclei; Evolution of muscles; Skeletal muscle fibers; Myotendinous junction; Muscle group; Groups of muscles; Msucle; Musculotendinous junction; Skeletal muscle cell
  • When a sarcomere contracts, the Z lines move closer together, and the I band becomes smaller. The A band stays the same width. At full contraction, the thin and thick filaments overlap.
  • (a) Some ATP is stored in a resting muscle. As contraction starts, it is used up in seconds. More ATP is generated from creatine phosphate for about 15 seconds. (b) Each glucose molecule produces two ATP and two molecules of pyruvic acid, which can be used in aerobic respiration or converted to [[lactic acid]]. If oxygen is not available, pyruvic acid is converted to lactic acid, which may contribute to [[muscle fatigue]]. This occurs during strenuous exercise when high amounts of energy are needed but oxygen cannot be sufficiently delivered to muscle. (c) Aerobic respiration is the breakdown of glucose in the presence of oxygen (O2) to produce carbon dioxide, water, and ATP. Approximately 95 percent of the ATP required for resting or moderately active muscles is provided by aerobic respiration, which takes place in mitochondria.
  • ATPase staining of a muscle cross section. Type II fibers are dark, due to the alkaline pH of the preparation. In this example, the size of the type II fibers is considerably less than the type I fibers due to denervation atrophy.
  • Types of [[pennate muscle]]. A – [[unipennate]];  B – [[bipennate]]; 
C – [[multipennate]]
  • [[Human embryo]] showing [[somite]]s labelled as ''primitive segments''.
  • polypeptide]] tail (only one tail of each pair is shown). The pairs of histones, H2A, H2B, H3 and H4, each have [[lysine]]s (K) in their tails, some of which are subject to post-translational modifications consisting, usually, of acetylations [Ac] and methylations {me}. The lysines (K) are designated with a number showing their position as, for instance, (K4), indicating lysine as the 4th amino acid from the amino (N) end of the tail in the histone protein. The particular acetylations [Ac] and methylations {Me} shown are those that occur on nucleosomes close to, or at, some DNA regions undergoing transcriptional activation of the DNA wrapped around the nucleosome.
  • Prisoner of war exhibiting muscle loss as a result of [[malnutrition]].
  • [[Jogging]] is one form of aerobic exercise.
  • Muscle types by fiber arrangement
  • Exercise-induced signaling pathways in skeletal muscle that determine specialized characteristics of slow- and fast-twitch muscle fibers
  • In [[muscular dystrophy]], the affected tissues become disorganized and the concentration of [[dystrophin]] (green) is greatly reduced.
  •  
'''Regulation of transcription in mammals.'''  An active enhancer regulatory region is enabled to interact with the promoter region of its target gene by formation of a chromosome loop. This can allow initiation of messenger RNA (mRNA) synthesis by RNA polymerase II (RNAP II) bound to the promoter at the transcription start site of the gene. The loop is stabilized by one architectural protein anchored to the enhancer and one anchored to the promoter, and these proteins are joined together to form a dimer (red zigzags). Specific regulatory transcription factors bind to DNA sequence motifs on the enhancer. General transcription factors bind to the promoter. When a transcription factor is activated by a signal (here indicated as phosphorylation shown by a small red star on a transcription factor on the enhancer) the enhancer is activated and can now activate its target promoter. The active enhancer is transcribed on each strand of DNA in opposite directions by bound RNAP IIs. Mediator (a complex consisting of about 26 proteins in an interacting structure) communicates regulatory signals from the enhancer DNA-bound transcription factors to the promoter.
  • Structure of muscle fibre showing a sarcomere under [[electron microscope]] with schematic explanation.

muscle         
WIKIMEDIA DISAMBIGUATION PAGE
MUSCLEs; Muscles (disambiguation); MUSCLE
n.
1) to contract; flex, tense; move; pull, strain; relax; wrench a muscle
2) to develop one's muscles
3) involuntary; smooth; striated; voluntary muscles
4) muscles ache
muscle         
WIKIMEDIA DISAMBIGUATION PAGE
MUSCLEs; Muscles (disambiguation); MUSCLE
(muscles, muscling, muscled)
Frequency: The word is one of the 3000 most common words in English.
1.
A muscle is a piece of tissue inside your body which connects two bones and which you use when you make a movement.
Keeping your muscles strong and in tone helps you to avoid back problems...
He is suffering from a strained thigh muscle...
N-VAR
2.
If you say that someone has muscle, you mean that they have power and influence, which enables them to do difficult things.
Eisenhower used his muscle to persuade Congress to change the law...
= clout
N-UNCOUNT
3.
If a group, organization, or country flexes its muscles, it does something to impress or frighten people, in order to show them that it has power and is considering using it.
The Fair Trade Commission has of late been flexing its muscles, cracking down on cases of corruption.
PHRASE: V inflects
4.
If you say that someone did not move a muscle, you mean that they stayed absolutely still.
He stood without moving a muscle, unable to believe what his eyes saw so plainly.
PHRASE: V inflects, with brd-neg
Muscle         
WIKIMEDIA DISAMBIGUATION PAGE
MUSCLEs; Muscles (disambiguation); MUSCLE
·noun ·see Mussel.
II. Muscle ·noun An organ which, by its contraction, produces motion.
III. Muscle ·noun The contractile tissue of which muscles are largely made up.
IV. Muscle ·noun Muscular strength or development; as, to show one's muscle by lifting a heavy weight.

Wikipedia

Skeletal muscle

Skeletal muscles (commonly referred to as muscles) are organs of the vertebrate muscular system and typically are attached by tendons to bones of a skeleton. The muscle cells of skeletal muscles are much longer than in the other types of muscle tissue, and are often known as muscle fibers. The muscle tissue of a skeletal muscle is striated – having a striped appearance due to the arrangement of the sarcomeres.

Skeletal muscles are voluntary muscles under the control of the somatic nervous system. The other types of muscle are cardiac muscle which is also striated and smooth muscle which is non-striated; both of these types of muscle tissue are classified as involuntary, or, under the control of the autonomic nervous system.

A skeletal muscle contains multiple fascicles – bundles of muscle fibers. Each individual fiber, and each muscle is surrounded by a type of connective tissue layer of fascia. Muscle fibers are formed from the fusion of developmental myoblasts in a process known as myogenesis resulting in long multinucleated cells. In these cells the nuclei, termed myonuclei, are located along the inside of the cell membrane. Muscle fibers also have multiple mitochondria to meet energy needs.

Muscle fibers are in turn composed of myofibrils. The myofibrils are composed of actin and myosin filaments called myofilaments, repeated in units called sarcomeres, which are the basic functional, contractile units of the muscle fiber necessary for muscle contraction. Muscles are predominantly powered by the oxidation of fats and carbohydrates, but anaerobic chemical reactions are also used, particularly by fast twitch fibers. These chemical reactions produce adenosine triphosphate (ATP) molecules that are used to power the movement of the myosin heads.

Skeletal muscle comprises about 35% of the body of humans by weight. The functions of skeletal muscle include producing movement, maintaining body posture, controlling body temperature, and stabilizing joints. Skeletal muscle is also an endocrine organ. Under different physiological conditions, subsets of 654 different proteins as well as lipids, amino acids, metabolites and small RNAs are found in the secretome of skeletal muscles.

Skeletal muscles are substantially composed of multinucleated contractile muscle fibers (myocytes). However, considerable numbers of resident and infiltrating mononuclear cells are also present in skeletal muscles. In terms of volume, myocytes make up the great majority of skeletal muscle. Skeletal muscle myocytes are usually very large, being about 2–3 cm long and 100 μm in diameter. By comparison, the mononuclear cells in muscles are much smaller. Some of the mononuclear cells in muscles are endothelial cells (which are about 50–70 μm long, 10–30 μm wide and 0.1–10 μm thick), macrophages (21 μm in diameter) and neutrophils (12-15 µm in diameter). However, in terms of nuclei present in skeletal muscle, myocyte nuclei may be only half of the nuclei present, while nuclei from resident and infiltrating mononuclear cells make up the other half.

Considerable research on skeletal muscle is focused on the muscle fiber cells, the myocytes, as discussed in detail in the first sections, below. However, recently, interest has also focused on the different types of mononuclear cells of skeletal muscle, as well as on the endocrine functions of muscle, described subsequently, below.


Beispiele aus Textkorpus für muscle
1. The condition, known as heterotopic ossification, occurs when the growth extends into muscle, causing discomfort, diminished motion and muscle weakness.
2. Punchbag: Sylvester Stallone as Rocky Marciano The human punchbag Muscle tissue generates about 0.3 micronewtons of force per muscle fibre.
3. "I lost all the muscle on my right side so my arm was not attached to solid breast muscle.
4. Americans almost exclusively eat the muscle meat.
5. These include hypertension, muscle atrophy and diabetes.