Describe two biological rhythms. (9)

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Two biological rhythms would be the circadian rhythm and the infradian rhythm. The circadian rhythm occurs every 24 hours eg. the sleep wake cycle. This suggests an internal mechanism. The SCN is the pacemaker (bio clock)

low light> optic chiasm> stimulates SCN> stimulates pineal gland> melatonin> enhances seretonin> brain activity falls> sleep.

  • Siffre cave study, a man 25hr cycle, 2

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