Answer:
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.
