Myofilament vs. Myofibril

Myofilamentnoun

A filament within a myofibril, constructed from proteins

Myofibrilnoun

(muscle) Any of the cylindrical organelles, found within muscle cells, that are the contractile unit of muscles.

Myofilament

Myofilaments are the two protein filaments of myofibrils in muscle cells. The two proteins are myosin and actin and are the contractile proteins involved in muscle contraction.

Myofibrilnoun

one of many contractile filaments that make up a striated muscle fiber

Myofibril

A myofibril (also known as a muscle fibril or sarcostyle) is a basic rod-like organelle of a muscle cell. Muscles are composed of tubular cells called myocytes, known as muscle fibres in striated muscle, and these cells in turn contain many chains of myofibrils.