GENERAL HISTOLOGY

Detailed explanation-1: -Smooth muscle cannot be controlled consciously and thus acts involuntarily. The non-striated (smooth) muscle cell is spindle-shaped and has one central nucleus. Smooth muscle contracts slowly and rhythmically.

Detailed explanation-2: -Smooth muscle and Cardiac muscles are involuntary muscles which are found in those organs where involuntary movement is possible, like alimentary canal and heart respectively.

Detailed explanation-3: -Smooth muscle is an involuntary non-striated muscle, so-called because it has no sarcomeres and therefore no striations (bands or stripes). It is divided into two subgroups, single-unit and multiunit smooth muscle. Within single-unit muscle, the whole bundle or sheet of smooth muscle cells contracts as a syncytium.