Physiology Resting muscle length means? A Length of actin and myosin before contraction B The length of the muscle fiber at the onset of contraction which is required to attain maximum active tension C It is about 4 micrometers D Length at which muscle has minimal tension 💡 Explanation Resting muscle length means? ✓ Correct Answer: B. The length of the muscle fiber at the onset of contraction which is required to attain maximum active tension