biopsychology biological rhythms

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9 Terms

1
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What is a biological rhythm?

a change in body processes or behaviour in response to cyclical changes within the environment

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What are biological rhythms controlled by?

endogenous pacemakers

exogenous zeitgebers

3
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What are endogenous pacemakers?

the body’s internal biological clocks (internal pacemaker. e.g. melatonin hormone secreted by the pineal gland and the suprachiasmatic nucleus -SCN- which triggers this).

4
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What are exogenous zeitgebers?

external changes in the environment (external time giver. e.g. the outside light)

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What is the circadian rhythm?

the sleep-wake cycle

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What are the endogenous pacemakers of the circadian rhythm (the sleep-wake cycle)?

SCN

7
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function of the SCN?

detects reduced light via information from eyes

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function of pineal gland?

releases the hormone melatonin (hormone) which makes someone feel tired

9
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Morgan (1995) hamster study on cycadian rhytms