What is the basic scheme of the nervous system

Last week i was assigned a thematic. we have groups of three but the people i was assigned with haven't been in school for days. i would appreciate if anyone can me with my thematic . i highlighted most of the important steps and i circled my thematic topic. in desperate need : ( its due on february 19

Genetic disorders can result when sister chromatids fail to seperate properly. during what phase is this problem most likely to occur?

Explain how negative feedback caused the changes in plasma glucagon concentration observed during the experiment.