Heart muscle cells are cylindrical, branched, and uninucleate (having a single nucleus).
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Smooth muscles are found in the iris of the eye, in ureters, and in the bronchi of the lungs.
Smooth muscle cells are long with pointed ends (spindle-shaped) and uninucleate (having a single nucleus), and they are also called unstriated muscles because they lack striations.
The rhythmic contraction and relaxation of the heart are carried out by cardiac muscles.
Smooth or involuntary muscles control movements like the movement of food in the alimentary canal and the contraction and relaxation of blood vessels.