Action potential has a refractory period that divides in two: relative and absolute. Relative refractory period allows the generation of another AP but needs a greater initial despolarization to reach the excitation threshold. Absolute refractory period cannot generate another action potential no matter how strong the stimulus is.
I would tell her to research all information. check to see the qualifications necessary to enroll. A married, and retired couple can only claim 1 or the other's medicare benefits, whomever made more money annually (per year) is the person who has the higher benefits..