19. What are the main
proteins that constitute the
sarcomere? What is the
function of those molecules in
the muscle cells?

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In the sarcomere are organized
actin myosin blocks. Troponin
tropomyosin also appear to
actin.

The molecules when activated
calcium ions liberated the proximities
of sarcomere are pulled myosin
molecules. This between
actin and shortens the myofibrils
the phenomenon of
contraction.