How Caffeine Works
Kurzgesagt – In a Nutshell • 2026-04-13T14:01:13Z • 1:12:00 • intermediate • Health
Lead
Ever wondered how that morning cup of coffee keeps you alert? Dive into the fascinating science of caffeine and discover how it impacts your brain and body!
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Vocabulary
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psychoactive
/ˌsaɪkoʊˈæktɪv/
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Definition
A substance that affects the mind, altering mood, perception, or behavior.
Example
Caffeine is considered a psychoactive drug because it influences brain activity.
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adenosine
/əˈdɛnəˌsiːn/
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Definition
A nucleoside that plays a role in energy transfer and signaling in the brain, often associated with promoting sleep.
Example
Adenosine levels increase during wakefulness and decrease during sleep.
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receptors
/rɪˈsɛptərz/
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Definition
Proteins on the surface of cells that receive chemical signals from neurotransmitters or hormones.
Example
Caffeine blocks adenosine receptors, which helps to keep you awake.
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neurotransmitters
/ˌnjʊərəʊˈtrænsmɪtərz/
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Definition
Chemicals that transmit signals across a synapse from one neuron to another in the brain.
Example
The release of neurotransmitters can enhance mood and improve focus.
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withdrawal
/wɪðˈdrɔːəl/
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Definition
The physical and mental symptoms that occur after stopping or reducing intake of a substance.
Example
Caffeine withdrawal can lead to headaches and irritability.
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tapering
/ˈteɪpərɪŋ/
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Definition
Gradually reducing the amount of a substance taken over time.
Example
Tapering off caffeine can help minimize withdrawal symptoms.
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