Answer:
B. Free-radical theory
Explanation:
The free radical theory statutes that <em>ageing is the result of the accumulation of the damage to cells and tissues caused by reactive oxygen species</em> as a result of aerobic metabolism.
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For a threshold is to be reached then there should be generation of numerous (EPSP) which must arrive at initial segment.
- Excitatory postsynaptic potential can be regarded as a postsynaptic potential which aids the action of postsynaptic neuron and activate it so that it can fire an action potential.
- However, to numerous number of this (EPSP) needed to be generated for threshold to be reached during the process.
We can conclude that the higher the generation, the higher the effectiveness.
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The answer would be c or a