What Are the Types of Muscle Tissue and What Characteristics Make Each Type Unique?
While these muscles differ slightly, they function in a similar way.
Muscles made from these types of cells include those found in the walls of blood vessels, urinary bladder, and the digestive system. Skeletal muscles allow movement by being attached to bones in the body. Skeletal muscles control voluntary movements which can be consciously controlled. Skeletal muscles are made up of cylindrical fibers which are found in the locomotive system. The nucleus of each cell tends to be toward the edge of each cell and the cells are striated. Cardiac muscles are roughly quadrangular in shape and have a single central nucleus. The cells form a network of branching fibers. The muscles are cross striated and are involuntary. The muscles are found in the heart. Muscle tissues are supplied with nerve fibers that carry messages to and from the central nervous system (brain and spinal cord). Muscles are composed of about 75 per cent water, 20 per cent protein, and about 5 per cent is made up of carbohydrates, lipids, inorganic salts, and nonprotein nitrogenous compounds. The composition does vary in the different muscles.
Muscle fibers can contract because they are made of proteins, called actin and myosin, that form long filaments (or fibers). When muscles contract, these protein filaments slide or glide past one another, shortening the length of the cell. When your muscles relax, the length extends back to the previous position. Nearly all movement in the body is the result of muscle contraction.