Major Neurotransmitters and Their Effects

Table 32.1 Major Neurotransmitters and Their Effects Neurotransmitter Acetylcholine (ACh) Epinephrine and norepinephrine Dopamine Serotonin GABA Examples of Effects Induces skeletal muscle contraction, slows cardiac muscle contraction rate, affects mood and memory Speed heart rate; dilate the pupils and airways to lungs; slow gut contractions; increase anxiety Dampens excitatory effects of other neurotransmitters; has roles in memory, learning, fine motor control Elevates mood; role in memory Inhibits release of other neurotransmitters