The etiology of multiple sclerosis may involve:
a. The formation of neurofibrillary tangles
b. Lack of an enzyme needed for myelination
c. Immune system sensitization by a virus
d. A genetic error for the protein that forms myelin
Question 2
The neurons of the lateral hypothalamus that release ___ help to stabilize the sleep and waking system, to prevent inappropriate switching into sleep.
a. serotonin
b. orexin
c. glutamate
d. histamine