Myofibrils are composed of protein filaments called actin and myosin. True or False

True

Explanation:

A myofibril (also known as a muscle fibril) is a basic rod-like unit of

a muscle cell. Muscles are composed of tubular cells called

myocytes, known as muscle fibers in striated muscle, and these

cells in turn contain many chains of myofibrils. They are created

during embryonic development in a process known as myogenesis.

Myofibrils are composed of long proteins including actin, myosin,

and titin, and other proteins that hold them together. These proteins

are organized into thick and thin filaments called myofilaments,

which repeat along the length of the myofibril in sections called

sarcomeres. Muscles contract by sliding the thick (myosin) and thin

(actin) filaments along each other.

Answer: True

Explanation: Myofibril is a fundamental component of a muscle cell that looks like a thin straight bar. They are composed of protein filaments called actin, myosin, and titin which grasp them in proximity to another. However, these proteins are categorized into thick and thin lengthy chain of proteins bound together for strength and rigidity made from myofibrils, which duplicate along in measurement from end to end of the myofibrils.