Can muscles contract if there isn't any free calcium in the cell?

On getting signal from the brain the muscles contract as the body pulls calcium from the blood to the muscle cells. Calcium binds with troponin drawing it out of its position and tropomyosin follows troponin as these two proteins are linked together. On movement of the troponin and tropomyosin, actin and myosin activation occurs and they move towards each other thus contracting the muscle. Therefore, free calcium is required for muscle contraction.

the generally accepted parts of modern cell theory include: all known living things are made up of one or more cells. all living cells arise from pre-existing cells by division. the cell is the fundamental unit of structure and function in all living organisms.