_______________________ muscle cells are cylindrical and multinucleated.
  . if a second stimulus is given before a muscle relaxes completely the second contraction is stronger than the first until a max level is reached. What is meant by summation? if a second stimulus is given before a muscle relaxes completely the second contraction is stronger than the first until a max level is reached. Contraction cause fibers to shorten in all directions, cells go from spindle shaped to more round. Contraction of smooth muscle is much slower than skeletal muscle but smooth muscle is more fatigue resistant than skeletal muscle and can maintain contractions for far longer. Energy for Muscle Contration. ATP required for contraction and is generated by 3 mechanisms. Myoblast transfer therapy – inject with health myoblast cells that fuse with health ones, this provides the normal gene and allows the fibers to produce normal dystrophin. Insertion of plasmids with the correct genes also being tried. Myotonic muscular dystrophy. Failure of muscles to relax after contraction. A unique aspect of cardiac muscle is the number of nuclei found inside the cell. Skeletal muscle cells are multinucleated from the fusion of muscle cells and smooth muscle cells are strictly mononucleated, and cardiac muscle cells are mononucleated in humans. In some animal species, the fetus and post parturition infant most cardiac muscle cells are mononucleated. The size of the muscle and the number of myofibrils and even fibers will increase as the strength increases. Capillaries and CT will increase also, including CT of tendons and ligaments. In some muscles the fibers are parallel to the long axis of the muscle, in some they converge to a narrow attachment, and in some they are oblique. Each skeletal muscle fiber is a single cylindrical muscle cell. An individual skeletal muscle may be made up of thousands of muscle fibers bundled together and wrapped in a connective tissue covering. Each muscle is surrounded by a connective tissue sheath called the epimysium. The multinucleated cells in normal tissue are considered to be formed by cell-cell fusion, for the most part [ 1, 13 ]. As for the neoplastic multinucleated cells, Reed-Sternberg cells are well known and extensively reported in the past literature. Myofibrils and Sarcomeres. Muscle fibers contain bundles of myofibrils, the contractile elements of the cell, which run the length of the fiber. Myofibrils contain actin and myosin myofilaments arranged in sarcomeres (sarcomeres can be said to be the contractile elements of the myofibrils). The muscle fibers that make up skeletal muscle are called myofibers and consist of long, cylindrical, multinucleated cells. These cells are made of actin and myosin fibers repeated as a sacromere. Therefore skeletal muscle cells are long, cylindrical, multinucleated cells made of actin and myosin myofibers. They come together to create the fibers which make up tissues such as skeletal muscle tissue. 6 people found this useful.
Skeletal muscle