Circadian rhythm
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A circadian rhythm, or circadian cycle, is a natural oscillation that repeats roughly every 24 hours. Circadian rhythms can refer to any process that originates within an organism and responds to the
Key centers of the mammalian and Drosophila brains (A) and the circadian system in Drosophila (B)
Molecular interactions of clock genes and proteins during Drosophila circadian rhythm
A variation of an eskinogram illustrating the influence of light and darkness on circadian rhythms and related physiology and behavior through the suprachiasmatic nucleus in humans
CircadianLux light at the JCCPA that support circadian rhythm indoors
Cortisol
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Cortisol is a steroid hormone in the glucocorticoid class of hormones and a stress hormone. When used as medication, it is known as hydrocortisone.
Circadian rhythm
…core body temperature minimum, and plasma level of cortisol. For temperature studies, subjects must remain awake but calm and semi-reclined in near darkness while their rectal temperatures are taken continuously…
Change in plasma cortisol cycle (mcg/dL) over 24 hours