Hi!

Well this is actually pretty tricky.

And I want to advise you that although your intention of studying this "hunger motivation" part for both AP Biology and AP Psychology is a great idea in terms of genuine academics, it won't do you any good in terms of getting the questions right (or for the frq section of ap psych)

So I will explain your question from the perspective of AP Psycholgy ok? Meaning, enough so that you are no longer curious as to your question, but only enough for AP Psych, not for AP Bio.

You first need to understand that hunger motivation is a very complicated process in our human body and scientists are still trying to figure out the exact effect of hormones (such as the ones you mentioned)

When it comes to any physiological or biological process in our human body, you need to understand that it's only "what we have discovered so far" that is taught. But there can obvioulsy be many variables and different outcomes. That's why there are constant researches being conducted.

So now to get into your question,

1. Yes, insulin and GLUCAGON control glucose level; thus glucagon and glucose aren't the same thing, technically. Glucagon is a hormone, and glucose is what we simply call blood sugar.

2. now for your next question, wanting me to elaborate how glucose and insulin can regulate hunger, haha this is the part where I cannot help you completely. Actually if you want this question answered perfectly, you would need a professor with a PHD in biology. In fact, he too would tell you he does not know everything. That's actually how complicated that question is. So I will help you as far as my knowledge allows, but once again, the body isn't as simple as you think ^^.

First of all, glucose is our blood sugar, so obviousy the higher it is, the more satiated we are(full). But the thing is, our body reacts very strangely to "high" glucose level. After some period of having high glucose level, when it starts dropping, our body notices that change but takes it VERY sensitively; thus we feel hunger and crave more food although we might've already eaten a lot. So, technically, you san say that high glucose level equals to BOTH LESS HUNGER AND MORE HUNGER. It just depends on which period of high glucose level you want to focus on.

Second, Insulin is a hormone that regulates the blood sugar level(glucose). To put this simply, it converts glucose into energy so that we can use it. This also means that the more insulin there is, the less blood sugar there is (because it'll all be converted into energy). Result? obviously hunger.

What I have written above is THE SIMPLEST ANSWER for what you've asked. It can get a lot more complicated haha, but I won't go on more, as this part of psychology really isn't what I am best at lol.

Have fun!