REM (R)sleep Is Sometimes Called Paradoxical Sleep Because

Multiple Choice

REM (R) sleep is sometimes called paradoxical sleep because

A) our heart rate is slow and steady,while our breathing is highly irregular.
B) we are deeply asleep but can be awakened easily.
C) our nervous system is highly active,while our voluntary muscles hardly move.
D) it leads to highly imaginative dreams that are perceived as colorless images.