Question

Short / Long answer type questions.
Describe the structure of a myofibril of a striated muscle.

Answer 1

• Muscles are composed of tubular cells called myocytes, known as muscle fibres in a striated muscle, and these cells, in turn, contain many chains of myofibrils.
• The myofibrils are made up of thick and thin myofilaments, which help give the muscle its striped appearance.
• The thick filaments are composed of myosin, and the thin filaments are predominantly actin, along with two other muscle proteins, tropomyosin and troponin.
• Myofilaments repeat along the length of the myofibril in sections called sarcomeres.