How does material move from the respiratory system to the circulatory
system?
O A. By attaching neuroendocrine cells
O B. By diffusing across a membrane
O C. By moving across a synapse
D. By sending hormones between cells

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