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Compare the striated and non-striated muscles with reference to structure, location, and method of work. In what respects is the muscular tissue of the heart like the striated, and in what respects like the non-striated, muscular tissue? If muscles could push as well as pull, would so many be needed in the body? Why? Locate muscles that work to some extent against elasticity and gravity.
*Structure of the Heart Muscle.*—The cells of the heart combine the structure and properties of the striated and the non-striated muscle cells, and form an intermediate type between the two. Each cell has a well-defined nucleus, but the sarcolemma is absent. They are placed end to end to form fibers, and many of the cells have branches by which they are united to the cells in neighboring fibers.
The cells of white fibrous connective tissue have not been seen to form striated or even non-striated muscle." As implied by these quotations, a constant and progressive differentiation of cells prevails in the developing embryo; and when complete, certain groups of cells act as specialists in doing only certain kinds of work for the body.
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