Which theory explains muscle contraction? A) Sliding filament theory B) Cross-bridge theory C) Muscle spindle theory D) T-tubule theory Drop your answer in the comments below 👇👇 👉 EXPLANATION: The correct answer is A) Sliding filament theory. Here’s why the sliding filament theory explains muscle contraction: The sliding filament theory describes the process by which muscles contract. According to this theory, muscle fibers contract by the sliding of thin (actin) and thick (myosin) filaments