Which of the following seems to be involved in causing sleepiness?
A)high blood levels of adenosine
B)low blood levels of adenosine
C)low blood levels of melatonin
D)high blood levels of dopamine

Question

Quizplus · Accepted Answer

Adenosine is a chemical that builds up in the brain during the day and signals it is time to sleep. It binds to receptors in the brain, causing drowsiness and promoting sleep. High levels of adenosine in the blood indicate that the body needs rest and can lead to feelings of sleepiness. Low blood levels of adenosine, therefore, would not cause sleepiness. Melatonin and dopamine are also involved in regulating sleep, but not directly in causing sleepiness.

Which of the Following Seems to Be Involved in Causing