The endocrine system consists of
A) a system of ducted glands within the digestive system.
B) a system of ductless glands in the brain and spinal cord.
C) a system of ductless glands distributed throughout the body.
D) a system of ducted and ductless glands used for reproduction.
Question 2
The two principal neurotransmitters of the autonomic nervous system are
A) serotonin and dopamine.
B) acetylcholine and norepinephrine.
C) epinephrine and dopamine.
D) the same as those of the central nervous system.