Question

The diagram shows a model of the hierarchical organization of the muscular system.

[img]https://imagebank.illuminateed.com/imagebank/1616580[/img]
Which of these best explains the next level of organization in this model?

A
muscle cells, because they contain protein

B
mitochondria, because they produce energy for movement

C
muscle cells, because they are the smallest living unit in the body

D
mitochondria, because they are smaller than cells and have membranes