- A Acetylcholine, released at the neuromuscular junction
- B Noradrenaline (norepinephrine)
- C Dopamine, acting mainly within reward pathways of the brain
- D Serotonin, regulating mood within central synapses
Correct answer: B. Noradrenaline (norepinephrine)
Explanation: Sympathetic postganglionic neurons release noradrenaline (norepinephrine) at effector organs. Pre-ganglionic neurons release acetylcholine.
Concept context
Brain, spinal cord, neurons, reflex arcs, and sense organs.