Which statement about adenosine is false? Group of answer choicesIt is expressed in many brain regionsIt builds up during wakefulness, creating a state of drowsiness.It acts on four different receptor subtypes.It is released by caffeine.

Tolerance to the stimulant effects of caffeine is due toGroup of answer choicesdown-regulation of adenosine receptorsup-regulation of adenosine receptorsdesensitization of adenosine receptorssensitization of adenosine receptors

Which of the following is not true of ATP?Group of answer choicesIt contains adenosine.It contains phosphate groups.It contains three high-energy bonds.It is the direct source of energy for cellular work.

hich of the following is true of the effect of caffeine on the nervous system?Multiple ChoiceIt increases relaxation.It increases attentiveness.It causes a drop in heart rate.It increases reaction time.

Adenine can undergo a spontaneous change to hypoxanthine

Which of the following is TRUE of sleep deprivation?Question 19 options:a) Sleep deprivation leads to a deficit in adenosine in the brain, which reduces hippocampal activation, and impairs learning b) Sleep deprivation leads to a buildup of adenosine in the brain, particularly in the hippocampus, impairing learning. c) Sleeping right after learning new material impairs learning as there is less time for the material to consolidate during wakefulness. d) The greater the sleep deficit, the more frequent attention lapses are. e) Both a and c f) Both b and d g) Both c and d