biological rhythms

Question 1

what is the most importand endogenous pacenaker

Answer 1

the superchiasmatic nucleus

Question 2

what are the two things biological rythms are controlled by

Answer 2

endogenous pacemakers and exogenous zeitgebers

Question 3

what are circadian rhythms

Answer 3

the sleep wake cycle and they last 24 hours

Question 4

what is the sleep wake cycle

Answer 4

governed by the scn
light resets the scn

Question 5

what are the steps of the sleep wake cycle

Answer 5

scn recieves info about light
scn sends signal to pineal gland
melatonin gets increased at night

Question 6

what is the endogenous pacemakers

Answer 6

internal body clocks
most important is scn which is linked to the pineal gland

Question 7

whta are exogenous zeitgebers

Answer 7

external cues that alter the internal body clock to match the environment eg meal times and light

Question 8

wha is siffres 1975 study

Answer 8

stayed in a cave for 6 months with no exeogenous zeitgebers
altered circadian rythms

Question 9

what is morgans 1955 study

Answer 9

bred hampsters to have 20hr circadian rhythms
implanted neurons from scn into normwal hampsters
they started having altered circadian rhythms

Question 10

issue with siffre 1975

Answer 10

lacks generalisability as it has researcher bias
lacks pop validity

Question 11

limitation of circadian rhythms

Answer 11

duffy et al
difference between morning and night people
suggests individual differences in circadian rhythms