Which method is dependent upon injecting a radioactive chemical into the blood to measure blood flow?

Large bundles of many axons, which are visible to the unaided eye, are called

a. neurons. b. neurilemmas. c. nerves. d. neurotransmitters.

Freud believed that wishes, thoughts, and desires that one cannot voluntarily access were represented by:

a. unconscious forces c. manifest content b. conscious forces d. reality content