The notion that sleep or wakefulness is regulated by a substance that circulates within the blood is
A) proven by the observation that naps reduce sleep time the following night.
B) unlikely, given that the cerebral hemispheres of a dolphin sleep at different times.
C) REM and slow-wave sleep appear to involve independent mechanisms.
D) proven by studies of the dolphin sleep cycle.
E)proven by studies in which blood transfusion from a tired person to a rested person results in sleep in the recipient.
Question 2
Which of the following findings support the memory consolidation theory of REM sleep?
A) Deprivation of REM sleep results in poor learning in rats.
B) Active phases of brain development are associated with low levels of REM sleep.
C) Slow-wave sleep deprivation results in poor learning in rats.
D) Training in a complex maze reduces time spent in REM sleep.
E) REM sleep time is increased in retarded children relative to normal children.
Sickled and normal red blood cells
Angioplasty. One form is called balloon angioplasty, shown here. A balloon catheter is threaded into
Blood Pathway
The proportion of men and women with elevated blood pressure or taking hypertension medication incre
Valves in veins open to permit blood flow, close to prevent backflow.
Formation of blood cells