In light of the all or none law of muscle contraction, how can you explain the graded response?

In the "all or none" law of muscle contraction, it states that when the stimulus applied exceeds threshold then the the nerve sending signals to a few muscle fibers will give a complete response; contraction. Graded response is dependent on how many motor units have been recruited. The more motor units, the greater the force in the contraction.

Sunlight
Explanation:the sun is the major source of energy for organisms and the ecosystem which they are apart of .