Anatomy Of A Muscle Cell Essay -- essays research papers

image of Muscle CellsThere are three types of musculus tissue in the human body. These muscleman tissues are otiose muscles, smooth muscles and cardiac muscles. Each of these muscle tissues has it very own anatomical makeup, which vary from muscle to muscle. The muscle cells in a muscle are referred to as muscle fibers, these fibers are cadaveric muscle fibers, smooth muscle fibers and cardiac muscle fibers. The anatomy of a worn muscle fiber is formed during embryonic development. Skeletal muscle fibers arise from a hundred or more small mesodermal cells called myoblasts. The mature penurious muscle fiber has a hundred or more nuclei. Once fusion occurs the skeletal muscle fiber will lose the ability to bear up under cell division. This means that the number of muscle fibers is set before parenthood and most of these fibers will last a lifetime.The muscle growth that occurs after birth is a result of the enlargement of these existing muscle fibers. The mature muscle fibers have a few myoblasts, which remain as satellite cells. These myoblasts retain the power to join with one another or with damaged muscle fibers in order to regenerate these muscle fibers. John Centore2Dr. JainAnatomy & PhysiologyThe many nuclei of skeletal muscle fiber are located underneath the sarcolemma, which is the fibers plasma membrane. Thousands of invaginations of the sarcolemma, which are called T Tubules, Tunnel from the surface to the center of the muscle fiber. These T Tubules are open to the outside of the fiber and are alter with extra-cellular fluid. Muscle action emfs propagate along the sarcolemma and by the T tubules and quickly spread through the muscle fiber. This process ensures that all parts of the muscle fiber become excited by an action potential virtually simultaneously.The sarcoplasm is located inside the sarcolemma. Sarcoplasm is the cytol of a muscle fiber, it contains a good amount of glycogen, which is used for ATP synthesis. The sarcoplasm also contains myoglobin, a red colored, oxygen binding-protein, that is found only in muscle fibers. The myoglobin binds oxygen molecules, which are needed for ATP production within the mitochondria. The Mitochondria lie in rows throughout the muscle fiber, strategically close to the proteins that use ATP during contraction. The sarcoplasm is filled with little threadlike structures. These str... ...sponse to nerve impulses, hormones and other local factors. These muscle fibers can also stretch considerably and still maintain their contractile function.John Centore5Anatomy & PhysiologyDr. JainThe last of the three groups of muscle fiber is cardiac muscle fiber. The cardiac muscle fibers have the same arrangement of actin and myosin and the same bands, zones, and Z-disks as skeletal muscle fibers. However, the ends of cardiac muscle fibers connect to adjacent fibers by irregular transverse thickenings of the sarcolemma called intercalated disks. These disks contain desmosomes, which hold the fibers together, and gap junctions, which allow muscle action potential to spread from one cardiac muscle to another.In cardiac muscle fibers, calcium ions enter the sarcoplasm both from the sarcoplasmic reticulum and from extracellular fluid. The mitochondria in cardiac muscle fiber are larger and more numerous than in skeletal muscle fiber. Cardiac muscle fibers can also use lactic sultry produced by skeletal muscle fibers to make ATP, a benefit during exercise.I had already submitted my Email is Johnnynipaol.com,please excuse me for forgetting my email address....thank you