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1.Striated muscle has dark A bands (thick filaments) alternating with lighter I bands. In the middle of the A band there is a lighter region called the H band, into which thin filaments do not extend. 2. Each I band has a narrow dark line called the Z line or disc. 3. Each segment of myofibril from one Z disc to the next is the
1 Δεκ 1971 · PDF | A new model of Z-line structure in skeletal muscle is proposed. Unlike previous models it is capable of explaining the two apparently inconsistent... | Find, read and cite all the...
A sarcomere is defined as the region of a myofibril contained between two cytoskeletal structures called Z-discs (also called Z-lines or Z-bands), and the striated appearance of skeletal muscle fibers is due to the arrangement of the thick and thin myofilaments within each sarcomere (Figure 10.2.2).
Skeletal muscle • features •Skeletal muscle composed of muscle fibres •Each muscle fibre is an elongated unbranched cell, voluntary •Nuclei present at periphery • Striations, Alternative dark and light bands
lines called the Z lines. A sarcomere contains two types of protein myofilaments. The thick filaments are made up of a protein called myosin, and the thin filaments are made up of a protein called actin. Other proteins are also present. The I band is light colored because it contains only actin filaments attached to a Z line.
the z-line of a sarcomere. The thick myofilaments are composed mainly of the protein myosin. It is the orderly overlapping of the actin and myosin filaments that give cardiac and skeletal muscle their
Smooth muscle tissue functional unit: smooth muscle cell • Basal lamina • Mononuclear, nucleus rod shaped, central • Cell in the middle approx. 8 μm thick and about 15 - 500 μm long • Cytoplasm: intensive eosinophilic • No striation: smooth! • low energy requirement • slow but permanent contraction • great power effect
