Answer
Of the three skeletal muscle structures, muscle fiber, myofibril and thick filament, the muscle fiber is the largest; the myofibril is intermediate in size, and the thick filament is the smallest in size.
Work Step by Step
Comparative sizes of some skeletal muscle structures:
1. Muscle fiber: about 10 cm long and 10-100 um in diameter
2. Myofibril: approximately 2Um in diameter
3. Thick filament: 10 -15 nm in diameter, and 1-2 um long
