Physiology Muscle 79df646f The ratio of actin : troponin : tropomyosin molecules in an thin filament is: A 1:01:01 B 1:03:05 C 1:07:07 D 7:01:01 High-Yield Explanation A thin filament has 3 molecules - actin troponin tropomyosin in a ratio of 7: 1: 1.