According to the a neuron is either sufficiently stimulated and an action potential occurs, or a neuron is not sufficiently stimulated and an action potential does not occur.

According to the all or none law , a neuron is either sufficiently stimulated and an action potential occurs, or a neuron is not sufficiently stimulated and an action potential does not occur.

Explanation:

The All or none law states that the response of the neuron or muscle fiber would depend on a certain treshold, that would produce a responde or a zero respond. The comunication among neurons depend on the response from one axon to the other. The action potential will allow the electric response to go from one neuron to the other. It would be all or no respond at all, this is how the information from one neuron to the other does is always complete.

explanation:

allergens: overstimulate the nerve system

neurotics: attack nerve cells

mutagens: damage or otherwise alter dna sequence

generators: cause defects during growth and development  

carcinogens: cause unchecked cell growth

i hope you get the idea according to me these are the effects that happened.