They persist in the absence of cues indicaang the ame

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Unformatted text preview: Enhances immunity 4 Circadian Timing System circa ~ about dies ~ a day 5 Spectrum of Frequencies in Physiology 6 Human Circadian Rhythms 7 Jean ­Jacques d'Ortous de Mairan, 1729 8 Circadian Rhythms •  Circadian rhythms are generated by an internal clock or pacemaker. •  They persist in the absence of cues indicaAng the Ame or length of the day. •  Circadian pacemaker located in the suprachiasmaAc nucleus (SCN), a paired structure located in the anterior hypothalamus. –  Body’s master biological clock –  Self ­induced cyclic variaAons in clock protein concentraAons within SCN bring about cyclic changes in neural discharge from SCN •  Cycle takes about a day •  Drives body’s circadian (daily) rhythms –  SCN must be set daily by external cues so body’s biological rhythms are s...
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This note was uploaded on 11/15/2010 for the course BIO NPB 101 taught by Professor Dr.weidner during the Fall '10 term at UC Davis.

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