Question

What is an example of molecules that can directly act both as a neurotransmitter and hormones?

• A. Glucose
• B. Epinephrine and norepinephrine
• C. Parathormone and calcitonin
• D. Estrogen and progesterone

Answer 1

Answer:

B. Epinephrine and norepinephrine

Epinephrine and norepinephrine act as neurotransmitters at the smooth muscle neuromuscular junction as well as at the synapses of the brain. They also act as flight/fight hormones and a regulator of fuel metabolism in liver and muscle. Except for the anatomic difference in the chemical signaling of neuronal and hormonal signals, sometimes the same molecule act as neurotransmitter as well as hormones.