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They're made from many of precursor cells fusing to form a myofiber cell, and each of these precursor cells has their own nucleus which are retained in the specalised myofiber cell.
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∙ 10y ago
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What the meaning of polynucleated?
Polynucleated (if the word really exists which I see no reason why it shouldnt) refers to a cell having the property of many nucleas's within it. An example of a polynucleated cell would be skeletal muscle as opposed to cardiac and smooth muscle which are uninucleates.
What carries blood myocardium?
Conduction myofibers
How can rigor mortis be avoided in animals?
Rigor mortis is a natural and normal process that occurs in the carcass of all dead animals with developed muscular systems. It is caused by the continued activation of myofibers that eventually become "stuck" in the contracted phase. When all the myofibers are contracted and remain that way, the overall carcass becomes stiff and is said to be in rigor mortis. After a while, the myofibers start to break down under bacterial digestion and the rigor mortis will eventually collapse. There is no way to avoid rigor mortis to the best of my knowledge.
The perimysium is a collagenous connective tissue layer that groups several muscle fibers together into bundles called what?
Epimysium surrounds the muscle Perimysium sorrounds fascicles Endomysium surrounds myofibers
How are the striations of a skeletal muscle produced?
Of the three types of muscle, cardiac, smooth and skeletal, skeletal is striated. Myocytes form myoblast which form myofibers. The myofibers are composed of myofibrils which are comprised of sarcomeres which is responsible for the muscles striated appearance.
What are three types of fascia and their differences?
Fascia-the sheets of fibrous connective tissue that holds muscle fibres together.Epimysium is on the outer layer of the whole muscle (made up of bundles).Fascicles is the name for those bundles of muscles, which is surrounded by perimysium.Individual muscle fibers are surrounded by myofibers.
What are the organization levels of muscle?
From biggest to smallest you can have:the whole muscle (surrounded by the epimysium)then bundles- or fascicles if you prefer (these are surrounded by an perimysium)cells-which are also known as muscle fibers, or myofibers (surrounded by endomysium)myofibrilssarcomeresfilaments (both thin and thick)molecules (proteins actually, like actin, tropomyosin, troponin, and myosin)
What can be found in every skeletal muscle?
Mycocytes, muscle cells sometimes called muscle fibers, are individual components that make up skeletal muscle cells. They are formed from the fusion of myoblasts known as myogenesis. They are long, cylindrical, multinucleate cells called myofibers. They are held together by connective tissue. The muscle is attached to tendons and bones,
What is the definition of a Skeletal muscle cell?
A skeletal muscle cell is a type of cell that is long, cylindrical, and striated in appearance. These cells are responsible for voluntary movement and are attached to bones by tendons. Skeletal muscle cells contract to generate force and movement in the body.
What structure produces the heart's electochemical impullses?
Cardiac Conduction System (CCS)There are specialized areas of cardiac muscle tissue in the heart that beat on their own.These specialized areas together coordinate the events of the cardiac cycle, which makes the heart an effective pump.Components of CCS:1. Sinoatrial Node (S-A Node) located in right uppermost atrial wall and the primary pacemaker(rhythmically and repeatedly [60-100 per minute] initiates cardiac impulses)2. Atrioventricular Node (A-V Node): located in interatrial septum;serves as a delay signal that allows for ventricular filling. A back up pace maker.3. Atrioventricular (AV) Bundle (Bundle of His): only electrical connection between the atria and ventricles; located in the superior interventricular septum;4. Right and left bundle branches head downward through interventricular septum toward apex, and impulse finally reaches.5. Purkinje Fibers (Conduction Myofibers) large diameter conduction myofibers; located within the papillary muscles of the ventricles and conduct the impulse into the mass of ventricular muscle tissue.
What is an increase in the diameter of muscle fibers owing to the production of more myofibrils mitochondria sarcoplasmic reticulum and so forth?
Muscular Hypertrophy is the increase in muscle size due to increased number of myofibrils et al. Each muscle fiber (myocyte syncytium) consists of a cell membrane (sarcolemma) containing myofilaments actin and myosin arranged in end to end segments called sarcomeres. Muscle fibers are produced by fusion of multiple myoblasts during development, with the end result being a multinucleated syncytial cell which begins to produce myofilaments. Muscle growth occurs by production of additional myofilaments within each muscle fiber, the process called cellular hypertrophy. This results in enlargement of the whole muscle, also called hypertrophy. The number of myocytes remains the same. Existing myocytes can be repaired during regeneration following a severe injury. Satellite cells immediately adjacent to each muscle fiber proliferate and grow, fusing to eachother and existing damaged myofibers. Severe damage also results in fibrosis, or replacement of myofibers with stiff connective tissue, and results in impaired movement. In any case the number of muscle fibers remains the same.
What are the tissues in skeletal muscle?
Skeletal muscle is made up of individual components known as muscle fibers. These fibers are formed from the fusion of developmental myoblasts (a type of embryonic progenitor cell that gives rise to a muscle cell). The myofibers (muscle fiber) are long, cylindrical, multinucleated cells composed of actin and myosinmyofibrils repeated as a sarcomere, the basic functional unit of the cell and responsible for skeletal muscle's striated appearance and forming the basic machinery necessary for muscle contraction. The term muscle refers to multiple bundles of muscle fibers held together by connective tissue. Wikipedia dude ...
