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.
A muscle fiber consists of a bundle of muscle myofibrils. 4. muscle myofibril = contains thousands of sarcomeres-sometimes as many as 10,000 sarcomere units end-to-end. 5. sarcomere = is the functional unit of a muscle contraction because it is this structure that actually shortens during a contraction.