ralph & menaker (1988) + tau gene and SCN + hormones Flashcards
(4 cards)
1
Q
what did ralph & menaker discover about short circadian cycles in hamsters?
A
a mutation in the tau gene caused shorter rhythms; 22 hours for one copy, 20 hours for two.
2
Q
how did SCN transplants affect hamster circadian rhythms?
A
hamsters took on the rhythm of the donor SCN—confirming the SCN’s pacemaking role.
3
Q
what hormone does the SCN regulate through the pineal gland?
A
melatonin—released during the dark phase to promote sleep.
4
Q
how does the SCN affect the sympathetic system?
A
it controls glucocorticoid release, which mobilizes glucose and supports arousal.
