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Lab - Muscle Tissue Muscle Muscle cells are specialized for...

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Muscle Tissue Muscle Muscle cells are specialized for contractility, and they can be classified according to their microscopic appearance into 3 categories: 1. Smooth muscle which is found primarily in tubular organs. 2. Skeletal muscle which is generally attached to bones. 3. Cardiac muscle which is found in the wall of the heart. Smooth Muscle The smooth muscle cell is spindle-shaped with an elongated centrally located nucleus. If contraction of the cell has occurred the nucleus may be coiled. With ordinary fixation, its cytoplasm appears almost homogenous. Smooth muscle cells may occur as solitary fibers such as those found in the spleen capsule or prostate stroma. More generally, they are grouped together in bundles called fascicles. These fascicles may be isolated (e.g., arrector pili muscles) or they may be aggregated bundles or sheets around tubular organs or vessels. Blood vessels maybe found between the fascicles.
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