BIOLOGY 3UU3 Chapter Notes - Chapter Article #11: Fatal Familial Insomnia, Sleep Deprivation, Motor Neuron
6 May 2015
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Sleeper ordinarily exhibits relative inattention to the environment and is usually immobile. Sleep was marked by periods of rapid eye movement, rem sleep: alternates with non-rem sleep, quiet sleep. Most brain neurons are at or near their maximum levels activity while the subject is awake. In cerebral cortex or adjacent forebrain regions, reduce activity by only a small amount. Awake state, neuron goes about its own individual business. In contrast, during non-rem sleep, adjacent cortical neurons fire synchronously, with relatively low frequency rhythm. Breathing and heart rate tend to be quite regular. Small group of cells at base of forebrain is maximally active, responsible for inducing sleep, sleep-on neurons. Increased body heat while an individual is awake clearly activates some of cells, may explain drowsiness. Brain waves remain at low voltage because neurons are behaving individually. Brain cells in forebrain and brain stem regions are quiet active.
