myofibrils Striated contractile microfilaments in skeletal muscle cells. PICTURE
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Myofibrils Fibrils inside the cytosol of vertebrate muscle cells that give such cells their striated appearance; the functional unit of a myofibril is a sarcomere.
The myofibrils of each cell (and cardiac muscle is made of single cells — each with a single nucleus) are branched.
The branches interlock with those of adjacent fibers by adherens junctions.
Within the cells are myofibrils; myofibrils contain sarcomeres, which are composed of actin and myosin. Individual muscle fibres are surrounded by endomysium.
They are called myofibrils when you find them in muscles. The two proteins myosin and actin work together to help the muscle cells relax and contract. The two proteins need each other and together they are called actomyosin.
The muscle fibres are syncytial and contain myofibrils, tandem arrays of sarcomeres. Smooth muscle is muscle tissue in vertebrates made up from long tapering cells that may be anything from 20-500m long.
Most of the cell is occupied by striated, thread-like myofibrils. Within each myofibril there are dense Z lines. A sarcomere (or muscle functional unit) extends from Z line to Z line. Each sarcomere has thick and thin filaments.
Sarcoplasm (cytoplasm) filled by parallel myofibrils
Sarcolemma (surface membrane) forms deep tubes (T tubules) into the sarcoplasm along its length
Network of membranes called sarcoplasmic reticulum (ER) ...
Muscle cell; a long, cylindrical, multinucleated cell containing numerous myofibrils, which is capable of contraction when stimulated.
mRNA
See messenger RNA.
 See also: Organ, Tissue, Cells, Action, Protein
  
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