You can differentiate between a weak punch and a strong punch because the strong punch will have a greater:
A. Frequency of the action potentials created per unit time
B. Amplitude (size) of the action potential created
C. Speed at which action potentials travel along the axons
D. Duration of each action potential created
Please justify your answer
This is the principle of ‘summation’. The idea is that strength of contraction is controlled by the number and frequency of stimulation of the muscle.
Action potentials are all-or-nothing, meaning that they cannot have greater action potential. Similarly, they are just a pulse - their length doesn’t affect strength. This eliminates B and D.
Speed of action potential is determined by amount of myelination of the axon and the axon diameter. C is eliminated.