1. Actin: This is a thin filament protein that forms the backbone of the thin filaments in muscle cells. It interacts with myosin to create muscle contraction.
2. Myosin: This is a thick filament protein that forms the backbone of the thick filaments in muscle cells. It binds to actin and uses ATP to pull the thin filaments, causing muscle contraction.
While other proteins are present in muscle cells, actin and myosin are the most abundant and directly responsible for muscle contraction.
