MODEL RELEASED. Biological clock. Abstract image depicting human biorhythms,showing a clock superimposed onto a woman's head. Many biological processes are believed to take place under the direction of an internal clock mechanism. Processes such as wakefulness and tiredness are based on a daily or circadian (24 hour) cycle regulated by hormones such as melatonin and cortisol. Another example is the menstrual cycle,which repeats itself roughly every 28 days in fertile women | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / De Schwanberg, Victor |
Taille de l’image : | 3526 px × 5147 px |
Model Release : | Disponible |
Property Release : | Non requis |
Restrictions : | - |