Exogenous Pacemakers/Zeitgebers Flashcards
1
Q
Endogenous pacemakers?
A
Internal body clock
2
Q
Exogenous pacemaker?
A
External cues like light
3
Q
Role of SCN?
A
Group of nerves in hypothalamus
In both hemispheres
Maintains CR
Receives light info
4
Q
Decoursey?(chipmunks)
A
Destroyed SCN 30 chipmunks
Put back into natural habitat
Observed for 80 days
SWC disappeared
5
Q
Ralph?(hamsters)
A
Bred hamsters with 20 hour SWC
SCN cells transplanted into normal hamsters
Normal hamster SWC was 20 hours
6
Q
Penal gland?
A
Produces melatonin which makes us sleepy
7
Q
Exogenous zeitgeber?
A
Light/social cues
8
Q
What does light do?
A
Resets body’s SCN
Indirect influence on body processes
