MUSCLE PHYSIOLOGY

Detailed explanation-1: -A myofibril (also known as a muscle fibril or sarcostyle) is a basic rod-like organelle of a muscle cell. Skeletal muscles are composed of long, tubular cells known as muscle fibers, and these cells contain many chains of myofibrils. Each myofibril has a diameter of 1–2 micrometres.

Detailed explanation-2: -The myofibrils have a characteristic banding pattern detected under a light microscope referred to as striations. The main function of the myofibrils is to produce muscle contraction and relaxation.

Detailed explanation-3: -Within a muscle fiber, proteins are organized into organelles called myofibrils that run the length of the cell and contain sarcomeres connected in series. Because myofibrils are only approximately 1.2 m in diameter, hundreds to thousands (each with thousands of sarcomeres) can be found inside one muscle fiber.