Zeitgeber
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<timefyi-glossary slug="zeitgeber"></timefyi-glossary>Definição
Sinais ambientais externos (do alemão: 'doador de tempo') que sincronizam o relógio biológico de um organismo com o ciclo de 24 horas. A luz é o zeitgeber mais poderoso; outros incluem refeições, temperatura e interação social.