Answer:
Adenosine.
Explanation:
Adenosine is a neurotransmitter that is created in the brain and when it binds to the adenosine receptors, it slows down nerve activity and it creates a sensation of drowsiness.
<u>Caffeine</u> looks like adenosine to the receptors, therefore, when we have caffeine, <u>it binds to these receptors and there is no room left for the adenosine to bind</u>. However, the caffeine doesn't slow down nerve activity but, in the contrary, it speeds it up.
Therefore we can tell that caffeine blocks the receptors for the adenosine thus promoting wakefulness.
Where exactly are the questions, and how do I even access your questions on your page it doesn’t give me the option to.
Kübler-Ross was a psychiatrist who studied how we people deal with sorrow (after losing beloved ones, by knowing that we are ill or that we are going to die, etc.). There are five stages which people in this situation normally experience (but not obligatory):
(1) DENIAL
This is the first phase. It is filled with strong emotions and the dominant one is the shock and, after that, denying. Acknowledging tragic events and facts is very disturbing for our mind and it tries to protect itself.
(2) ANGER
Although we can be denying certain things for a long time, in the end, we realize that it won't help and things won't change. In this stage, our minds and our body respond with fury. Individuals tend to think that it is unfair that it happens to them.
(3) BARGAINING
In this phase, a person will desperately try to "negotiate" with the aim to change the outcome. We start to regret the things we did or didn't do earlier, we are ready to do anything and bear anything, just to make the things right.
(4) DEPRESSION
For the first time, we actually see the present moment and we feel all the grief we have been trying to deny or fight. A person is tired of the battle from the three previous stages and we assume our sorrow. It results in a depression, but this is a normal reaction in this kind of situation.
(5) ACCEPTANCE
Finally, after all the stages one has been through, he/she acknowledges reality. We accept the things as they are and we learn to live with them. It doesn't mean that we stop being sad, we have just passed through all the process and our life continues.
