7. The digestive system breaks down materials into substances the body can use. What structure inside the cell is most similar to the digestive system in humans?
A. cytoplasm
B. lysosome
C. nucleus
D. ribosome

Do the following statements describe actin, myosin, both of the proteins or neither of the proteins? (a) contains a binding site for calcium (b) found in the i band (c) exists in a globular (g) form and a filamentous (f) form (d) contains a binding site for atp (e) is a component of the thin filament (f) is a component of the thick filament