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

High levels of adenosine in the brain promote sleepiness by inhibiting wake-promoting neurons. As we stay awake throughout the day, adenosine levels gradually increase, leading to a greater propensity for sleep at night.

Which of the Following Seems to Be Involved in Causing