enow.com Web Search

Search results

  1. Results from the WOW.Com Content Network
  2. Circadian rhythm - Wikipedia

    en.wikipedia.org/wiki/Circadian_rhythm

    A circadian rhythm (/ s ər ˈ k eɪ d i ə n /), 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 (i.e., endogenous) and responds to the environment (is entrained by the environment).

  3. Transcription translation feedback loop - Wikipedia

    en.wikipedia.org/wiki/Transcription_translation...

    Transcription-translation feedback loop (TTFL) is a cellular model for explaining circadian rhythms in behavior and physiology. Widely conserved across species, the TTFL is auto-regulatory, in which transcription of clock genes is regulated by their own protein products.

  4. Circadian clock - Wikipedia

    en.wikipedia.org/wiki/Circadian_clock

    In vertebrates, the master circadian clock is contained within the suprachiasmatic nucleus (SCN), a bilateral nerve cluster of about 20,000 neurons. [10] [11] The SCN itself is located in the hypothalamus, a small region of the brain situated directly above the optic chiasm, where it receives input from specialized photosensitive ganglion cells in the retina via the retinohypothalamic tract.

  5. Chronobiology - Wikipedia

    en.wikipedia.org/wiki/Chronobiology

    While circadian rhythms are defined as regulated by endogenous processes, other biological cycles may be regulated by exogenous signals. In some cases, multi-trophic systems may exhibit rhythms driven by the circadian clock of one of the members (which may also be influenced or reset by external factors).

  6. Suprachiasmatic nucleus - Wikipedia

    en.wikipedia.org/wiki/Suprachiasmatic_nucleus

    Neurons in an intact SCN show coordinated circadian rhythms in electrical activity. [23] Neurons isolated from the SCN have been shown to produce and sustain circadian rhythms in vitro, [24] suggesting that each individual neuron of the SCN can function as an independent circadian oscillator at the cellular level. [25]

  7. Basic helix-loop-helix ARNT-like protein 1 - Wikipedia

    en.wikipedia.org/wiki/Basic_helix-loop-helix...

    Bmal1's regulation in circadian rhythms influences reproductive physiology such as ovulation, fertilization, and embryonic and fetal development via maternal circadian communication. [59] Studies have suggested mice that lack Bmal1 display reproductive ineffectiveness such as irregular cycles and reduced fertility. [60]

  8. Rev-ErbA alpha - Wikipedia

    en.wikipedia.org/wiki/Rev-ErbA_alpha

    Rev-erbα plays a role in the regulation of whole body metabolism through controlling lipid metabolism, bile acid metabolism, and glucose metabolism. [27] Rev-Erbα relays circadian signals into metabolic and inflammatory regulatory responses and vice versa, although the precise mechanisms underlying this relationship are not entirely ...

  9. Neuroscience of sleep - Wikipedia

    en.wikipedia.org/wiki/Neuroscience_of_sleep

    The circadian rhythm is a 24-hour cycle in the body, which has been shown to continue even in the absence of environmental cues. This is caused by projections from the SCN to the brain stem. This two process model was first proposed in 1982 by Borbely, [97] who called them Process S (homeostatic) and Process C (Circadian) respectively. He ...