Endogenous Pacemakers and Endogenous Zeitgebers 0.0 / 5 ? PsychologySleepA2/A-levelAQA Created by: carlamckenzieCreated on: 25-04-16 16:30 What's the main endogenous pacemakers in mammals called? The suprachiasmatic nucleus (SCN) 1 of 11 What is the SCN made up of? A tiny cluster of nerve cells 2 of 11 Where is the SCN located? In the hypothalamus, just above the place where the optic nerves from each eye cross over 3 of 11 What does the SNC do? Obtains info about light from the eye via the optic nerve 4 of 11 What happens if our endogenous clock is running slow? Morning light automatically shifts the clock ahead, putting the rhythm in step with the world outside 5 of 11 Is SNC just one thing? Explain... No it's a pair of structures, one in each hemisphere of the brain. Each of these is divided into the ventral and dorsal SCN 6 of 11 Describe the ventral SCN in terms of external cues... It's relatively quickly reset by external cues 7 of 11 Describe the dorsal SCN in terms of external cues... Much less affected by light and therefore more resistant to being reset 8 of 11 Where does the SNC send signals to? The pineal gland, directing it to increase production of the hormone melatonin at night 9 of 11 How does melatonin induce sleep? It inhibits the brain mechanisms that promote wakefulness 10 of 11 What is entrainment? The process of resetting the biological clock with endogenous zeitgebers 11 of 11
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