L21- sleep Flashcards
what is EEG
test for electrical activity in the brain
what is EOG
measures eye movement
what is EMG
activity in the skeletal muscle
what is reticular activating system
network of neurons in brain stem
-regulating arousal and sleep−wake transitions.
when is the reticular system acitve
when awake
how many stages of sleep and what are they
4 stages and REM sleep
what is REM sleep
when you dream
EEG, EMG adn EOG during slow wave sleep ( non -REM)
EEG- decreased brain activity
EOG - decreases
EMG - muscle activity but not as much as awake
waves associated with stages 1-4
large slow delta waves
brain activity and muscle activity during REM sleep
increased brain activity
loss of muscle tone
blood flow during Non REM sleep
decrease in electrical activity so decrease in metab
- decreases cerebral blood flow
blood flow during REM sleep
increased as SNS acitivty increases
2 components that contribute to respiratory drive during sleep
non feedback like behaviour and reticular system
feedback - metab gases and pH
what happen to ventilation during sleep
hypoventilation since ventilation decreases more than metabolism
what happens to CO2 sensitivity of the chemorececptors
reduced sensitivity since the set point for Co2 sensitivity is increased during sleep from 5.3kPa to 6
how does apnea occur regards to aponeic threshold
Pco2 falls below the threshold
- apnea happens
- CO2 starts to rise
- chemoR stimulated
what is sleep apnoea
breathing stops more than 10s
types of sleep aponea
obstructive
central
what is obstructive sleep aponea
brain influences the Ppl so it changes
but cant generate airflow due to obstruction
what is central sleep aponea
lack of brain influence
- respiratory muscles nto contracting so airflow not generated and no chnage Ppl
causes for obstructive sleep aponea
loss of muscle tone
obesity - lot of fat aorunf the neck so can contract the airways
-high BP
