These muscles are attached to our bones and skin by tendons and move our skeleton. Skeletal muscles consist of many bundles called fascicles. The fascicles are surrounded by the perimysium, or connective tissue. The fascicles are made of muscle fibers or cells. The muscle cells are made of myofibrils. The myofibrils are made of long molecules of protein called myofilaments. There are thick myofilament and thin myofilaments. Skeletal muscles shape and size depends on the arrangement of these fibers. For a skeletal muscle to contract it must receive an impulse from a
These muscles are attached to our bones and skin by tendons and move our skeleton. Skeletal muscles consist of many bundles called fascicles. The fascicles are surrounded by the perimysium, or connective tissue. The fascicles are made of muscle fibers or cells. The muscle cells are made of myofibrils. The myofibrils are made of long molecules of protein called myofilaments. There are thick myofilament and thin myofilaments. Skeletal muscles shape and size depends on the arrangement of these fibers. For a skeletal muscle to contract it must receive an impulse from a