Examlex
The largest part of a(n) ______ is its long, glowing tail, a narrow column of dust that may extend for 100 million km.
Serotonin
A neurotransmitter that contributes to feelings of well-being and happiness, also involved in regulating mood, appetite, and sleep.
Dopamine
A neurotransmitter in the brain that plays a key role in reward, motivation, memory, attention, and even regulating body movements.
Acetylcholine
A neurotransmitter in both the peripheral and central nervous systems that plays crucial roles in the stimulation of muscle cells and in various aspects of cognitive function, including memory.
Endorphin
Endorphins are natural chemicals produced in the brain that help to reduce pain and boost happiness.
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