Caffeine

Definition

Caffeine is a stimulant drug that blocks the action of adenosine, a neurotransmitter that promotes sleep and relaxation. It increases neural activity by binding to adenosine receptors in the brain, leading to increased alertness and decreased fatigue.

Related terms

Adenosine: Adenosine is a neurotransmitter that promotes sleep and relaxation. When caffeine blocks its action, it leads to increased wakefulness.

Stimulant: Stimulants are substances or drugs that increase neural activity in the brain, resulting in heightened alertness and energy levels.

Fatigue: Fatigue refers to extreme tiredness or exhaustion. Caffeine can help reduce fatigue by increasing neural firing and promoting wakefulness.