Adorable animal families that will make you aww. A brain stem stroke is a stroke which originates in the brain stem. Because the brain stem handles many of the body's basic life support functions, such as breathing and heart rate, a brain stem stroke can be fatal.
Muscle fibers are in turn composed of myofibrils. The myofibrils are composed of actin and myosin filaments, repeated in units called sarcomeres, the basic functional units of the muscle fiber.The sarcomere is responsible for the striated appearance of skeletal muscle, and forms the basic machinery necessary for muscle contraction.keletal muscle is made up of individual muscle cells or myocytes, known as muscle fibers. They are formed from the fusion of developmental myoblasts (a type of embryonic progenitor cell that gives rise to a muscle cell) in a process known as myogenesis.
muscle fibre-an elongated contractile cell that forms the muscles of the body. muscle cell, muscle fiber. fibre, fiber-any of several elongated, threadlike cells (especially a muscle fiber or a nerve fiber). muscle, musculus-one of the contractile organs of the body.