During which of schaie's stage if the focus on tasks that have personal meaning?
a. achieving
b. responsible
c. executive
d. reintegrative

a. Achieving

Explanation:

The theoretical model proposed by Schaie is based on the fulfillment of motivational objectives throughout the life cycle that are answering the three questions explained above: what do I need to know ?; How do I put it into practice ?; Why do i know what i know? Under these three premises, Shaie proposes 7 stages of cognitive development

Achievement stage It includes from the end of adolescence (19-20 years) to approximately 30 or 31 years. The knowledge acquired is managed to achieve personal goals: finish a career, find a job, a family, we fulfill our expectations that have kept us motivated towards some objectives that we met based on the tools and skills acquired in the previous stage.

Achieving.

Explanation:

According to Schaie's stages the achievement stage is the one where the person focus is on achieving personal  long term goals such as, marriage, a career, starting a family, etc. This stage is in the young adulthood between 20 and 30 years old approximately.

the answer that best describes the relative refractory period in the neuron is the resting membrane potential is restored, but concentrations of sodium and potassium are not restored to their original state.

the refractory period is the time during which another stimulus given to the neuron will not lead to a second potential. thus, because na+ channels are inactivated during this time, additional depolarizing stimuli do not lead to new action potentials.  

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