Muscle contraction theory

Muscle contraction occurs when tiny fibers inside muscle cells, called myofilaments, slide past each other. These myofilaments, primarily actin and myosin, form cross-bridges and use energy from ATP to pull on each other. This pulling shortens the muscle fibers, causing muscle contraction. When the brain signals a muscle to move, it triggers this process, allowing your muscles to generate force and produce movement or maintain posture. Once the signal stops, the filaments detach, and the muscle relaxes. This process allows us to perform all voluntary movements efficiently and precisely.