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phg 203 > Reticular Activating System > Flashcards

Reticular Activating System Flashcards

1
Q

Reticular Activating System is a network of nerve cells in brain stem transmitting _____and_____stimuli

A

environmental and sensory

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2
Q

we will_____ if RAS loses its function

A

lose consciousness

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3
Q

the ascending tract____ the reticular formation while the descending tracts can either give off______ signals or____ signals

A

activates

inhibitory

fascilatory

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4
Q

ASCENDING RAS

  • projects into cerebral cortex in 2 ways
  • through_____
  • through_____
  • begins in the____ part of the brain stem
  • extends upwards through___,____,____ and finally projects throughout the_____
A

sub-thalamus

thalamus

lower

pons ,midbrain, thalamus

cerebral cortex

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5
Q

Ascending RAS Is a specific System

T/F

A

F

Non-specific

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6
Q

ARAS can be activated by jUst 1 sensory stimuli

T/F

A

F

Different plenty stimuli

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7
Q

All sensory stimuli project their collaterals to RAS

T/F

A

T

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8
Q

RAS also Receives afferent from spinal cord

T/F

A

T

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9
Q

RAS sends impulse to all areas of cerebral cortex+other parts of brain

  • part of it Bypasses the ___ to project diffusely to the cortex
  • Other part ends in the_____ and related ____ nuclei and later projects_____ to the neocortex
A

thalamus

intralaminar

thalamic

nonspecifically

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10
Q

Non-specific projection of RAS into the cortex is responsible for____,____,_____

A

arousal, alertness and wakefulness

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11
Q

DESCENDING RETICULAR ACTIVATION SYSTEM

Can either be ___ or _____

A

Inhibitory

Fascilatory

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12
Q

DESCENDING RETICULAR ACTIVATION SYSTEM

INHIBITORY
-____ muscle tone

FACILITATORY
______ muscle tone

A

Regulates

Maintain

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13
Q

DESCENDING RETICULAR ACTIVATION SYSTEM

INHIBITORY
____ARAS

FACILITATORY
_____ARAS

A

Inhibit

Activate

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14
Q

Which component of the RAS is involved in Smoothness and accuracy of voluntary movements

A

DRAS - inhibitory

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15
Q

Ascending RAS receives inhibitory input from___ hypothalamus and _____ nuclei,____

A

posterior

thalamic

medulla

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16
Q

Which component of the RAS is involved in Maintenance of posture

A

DRAS - inhibitory

17
Q

Which component of the RAS is involved in Facilitates autonomic functions

A

DRAS - facilitatory

18
Q

Which component of the RAS is involved in Control of vegetative functions

A

DRAS inhibitory

19
Q

Which component of the RAS is involved in Reflex movements

A

DRAS inhibitory

20
Q

FUNCTIONS OF RAS

-_____fibers controls overall degree of cortical alertness or level of consciousness (maximum;wakefulness;sleep;coma)

A

ascending

21
Q

RAS is a sophisticated____ that____ and acts like an_____

A

filter

screens out the junk

executive assistant

22
Q

the RAS allows you to focus on what you value

T/F

A

T

23
Q

RAS Doesn’t allow you to perceive a threat immediately

T/F

A

F

It does

24
Q

RAS supports you when you set goals

T/F

A

T

25
Q

How RAS affects sleep

Sleep-wake transition:provides____ influence on external stimuli by______ during sleep.

A

an inhibitory

reducing afferent (sensory neurons) activity

26
Q

Neurons in RAS have a higher/lower firing rate during wakefulness ??

A

Higher

27
Q

medical procedures: anesthetics affect consciousness by______

A

turning off the RAS.

28
Q

Malatonin affects the RAS

T/F

A

T

29
Q

Damage to RAS could result in____, sleep disorders like_____,chronic fatigue,______

A

coma

narcolepsy

attention deficit disorder

30
Q

What is narcolepsy???

A

chronic sleep disorder that causes overwhelming daytime drowsiness

31
Q

Neurotransmitters in RAS

  • norepinephrine
  • acetylcholine
  • serotonin
  • dopamine
  • histamine
  • ______
  • gaba
  • ______(_____)
A

galanin

orexin; hypocretin

phg 203 (22 decks)

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