1. A nucleoside compound found in all living cells, composed of adenine and ribose, that plays a key role in energy metabolism and cell signaling.
Usage: biochemistry; medicine
2. A medication used to treat certain heart rhythm disorders by slowing conduction through the atrioventricular node.
Usage: pharmacology; cardiology

Examples

• Adenosine is produced when cells break down ATP for energy.
• The doctor administered adenosine to restore the patient's normal heart rhythm.
• Adenosine receptors in the brain help regulate sleep and wakefulness.
• Caffeine works by blocking adenosine receptors, which is why it keeps you alert.
• Adenosine levels in the blood increase during physical exercise.
• The drug adenosine is often used during cardiac stress testing.