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A sarcomere is best described as _______ a part of the sarcoplasmic reticulum a group of fascicles a group of myofibrils a unit within a myofibril all of the above

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A sarcomere is best described as A UNIT WITHIN A MYOFIBRIL.

Sarcomere is the smallest unit of the muscle composed of proteins myosin and actin. These proteins form the filament like structure that can slide on each other. Myosin forms the thick filament while the actin forms the thin filament.

Myofibril is also known as a muscle fibril that forms the basic structure of the muscle cell.