Do Muscle organs obey the all-or-none law?

Answer 1

Yes, muscle fibers obey the all-or-none law, which states that when a muscle fiber is stimulated to threshold, it will contract fully; if the stimulus is below threshold, it will not contract at all. This principle applies to individual muscle fibers, but whole muscles can exhibit graded responses based on the number of fibers recruited and the frequency of stimulation. Thus, while each muscle fiber follows the all-or-none law, the overall muscle action can vary in strength.