Explain how the following terms relate....

There are two types of myofilaments in muscle cells: thick filaments composed of bundles of myosin, and thin filaments composed of strands of actin.

Tropomyosin and troponin are regulatory proteins present in thin filaments.

Myofilaments make up the myofibrils, and consist of thick and thin filaments.

Myofibrils account for roughly 80% of cellular volume, and contain the contractile elements of the muscle cell.

Like skeletal muscle, actin and myosin interact by the sliding filament mechanism. The final trigger for contraction is a rise in intracellular calcium level, and the process is energized by ATP.

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