The symptoms of a stroke are different, depending on where in the brain the stroke is located, and doctors can use the symptoms to pinpoint the site of the stroke. In the case of a brain stem stroke, the patient often experiences vertigo, slurred speech, and difficulty speaking.
The smallest functional unit in a myofibril is a sarcomere. A sarcomere is composed of thin (actin) and thick (myosin) filaments. Actin slides past myosin when the muscle contracts.
(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).