Under the light microscope muscle cells appear striated with many nuclei squeezed along the membranes. Each cell is spindle shaped with a single nucleus and no visible striations figure 441 muscle tissue.
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The striation is due to the regular alternation of the contractile proteins actin and myosin along with the structural proteins that couple the contractile proteins to connective tissues.
Anatomy muscle tissue. Muscle tissue exists in three types cardiac skeletal and smoothand is the most abundant tissue type in most animals including humans. The walls of many human organs contract and relax automatically. Smooth muscle tissue contraction is responsible for involuntary movements in the internal organs.
Smooth muscle is found in the walls of hollow organs throughout the body. Skeletal muscle tissue is arranged in bundles surrounded by connective tissue. It forms the contractile component of the digestive urinary and reproductive systems as well as the airways and blood vessels.
Muscle fibers are organized into bundles supplied by blood vessels and innervated by motor neurons. Smooth muscle consists of cells with a single centrally located nucleus. The cells are elongated with tapered ends and do not appear striated.
Muscle tissue definition muscle tissue is a specialized tissue found in animals which functions by contracting thereby applying forces to different parts of t muscle tissue is a specialized tissue found in animals which functions by contracting thereby applying forces to different parts of the body. Smooth muscle lines the walls of blood vessels and certain organs such as the digestive and urogenital tracts where it serves to advance the movement of substances. Skeletal muscle tissue is composed of long cells called muscle fibers that have a striated appearance.
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