When there is no measurable activity in the brain and the brainstem, this is called brain death. In a person who has been declared brain dead, removal of breathing devices will result in cessation of breathing and eventual heart failure. Brain death is considered irreversible.
The functional unit of a skeletal muscle is called a sarcomere. Hole's Anatomy 12th edition, pg 287 states: Muscle fibers, and in a way muscles themselves, are basically collections of sarcomeres, discussed later in this chapter as the functional units of muscle contraction.. sarcomere. Tina Wright.
(1) Long, cylindrical organelle in striated muscle cells, composed mainly of actin and myosin filaments that run from one end of the cell to the other. (2) The contractile unit of a striated muscle. Supplement. The actin and myosin filaments are organized into repeated subunits along the length of the myofibril.These subunits are called sarcomeres. Word origin: myo - (muscle) + fibril. Related term: myofibrillar (adjective).2) The contractile unit of a striated muscle. Supplement. The actin and myosin filaments are organized into repeated subunits along the length of the myofibril. These subunits are called sarcomeres. Word origin: myo - (muscle) + fibril. Related term: myofibrillar (adjective). Synonym: 1  sarcostyle (obsolete).