Types of muscle cells
Skeletal Muscle cells. Skeletal muscle cells are long, cylindrical, and striated.
Cardiac Muscle Cells. Cardiomyocytes are short and narrow, and fairly rectangular in shape.
Smooth Muscle Cells. Smooth muscle cells are spindle-shaped and contain a single central nucleus.
Muscle Cell Definition. A muscle cell, known technically as a myocyte, is a specialized animal cell which can shorten its length using a series of motor proteins specially arranged within the cell.
This structure is similar to the smooth endoplasmic reticulum of other types of cell. To produce contractile force, myosin associates with actin filaments, rotating a little and then pulling the filaments across each other, like oars propelling a boat. Skeletal muscle cells also contain two regulatory proteins, known as troponin and tropomyosin.