MODEL RELEASED. Biological clock. Conceptual image of a resting boy lying below a tree seen through a watch face,representing the biological clock. Processes such as wakefulness and tiredness are based on a daily or circadian (24 hour) cycle regulated by hormones such as melatonin and cortisol | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Burriel, Oscar |
Bildgröße: | 3559 px × 2617 px |
Modell-Rechte: | vorhanden |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: |
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