Molecules of caffeine (left) and adenosine (right),computer artwork. Caffeine acts in the body as a central nervous system stimulant and is the world's most widely consumed psychoactive drug. Adenosine is an endogenous substance (produced naturally inside the body) and acts as a central nervous system inhibitor (depressant),with essentially opposite effects to caffeine | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / SCI-COMM STUDIOS |
Taille de l’image : | 3475 px × 2539 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |