The semicircular canals and vestibular sacs are parts of our vestibular system that help our body maintain balance. In which part of the body are these functions located?

An appeasement gesture is a ritualized behavior that communicates

a. the possibility of attack. b. sexual interest or receptivity. c. surrender. d. the marking of a territorial boundary. e. independence.

Which category of chemicals includes adenosine and several of its derivatives?

a. neuropeptides b. acetylcholine c. monoamines d. purines