Sleep

Question 0

Slow wave sleep

Answer 0

Stages 1-4
Sleep sympathetic acitivty is decreased, para increased
Can move, but brain doesnt really send- only to change position

Question 1

Stages of sleep

Answer 1

CYCLE (from top to bottom then back to top) every 90mins
Stage 1
2 (50% total sleep)
3
4
REM (20% total sleep)

Question 2

Which regions stimulate slow waves

Answer 2

Gaba neurones in preoptoc area of hypiothalamus

Serotonin from raphe nuclei

Question 3

Stage 1

Answer 3

Eyes make rolling movements
Lightest stage
Only few minutes

Question 4

Stage 2

Answer 4

Deeper 5-15 mins

Eye movements almost cease

Question 5

Stage 3

Answer 5

Eye and body movements absent

Question 6

Stage 4

Answer 6

Deepest sleep

20-40 mins

Question 7

From stage 4…

Answer 7

Enters stage 2 for brief 10-15 mins before entering brief REM
As night proceeds there is a decrease in stages3 and 4 and increase in REM

Question 8

Ascending reticular activation system

Answer 8

The arousal system
Secretes NE, serotonin during wake phase
Decreased activity during sleep
Ne and serotonin are inhibited in rem sleep

Question 9

Cause of rem sleep

Answer 9

Inc ach secretion by reticular formation