Blood Supply to the Brain - Lecture 3

Question 1

the brain is

Answer 1

one of the most active metabolically active organs

Question 2

how much of the total cardiac output does the brain receive

Answer 2

15-17%

Question 3

how much of the total oxygen available does the brain receive

Answer 3

20%

Question 4

when does loss of consciousness occur

Answer 4

less than 15 seconds after BF to the brain has stopped

Question 5

when does irreparable damage to the brain occur

Answer 5

within 5 minutes of no O2 to the brain

Question 6

cerebral hypoxia

Answer 6

deprivation of oxygen supply to the brain tissue

Question 7

mild or moderate cerebral hypoxia

Answer 7

diffuse cerebral hypoxia

Question 8

diffuse cerebral hypoxia

Answer 8

can cause confusion and fainting

effects are reversible

Question 9

total deprivation of oxygen to the brain

Answer 9

cerebral anoxia

Question 10

what can extended periods of cerebral hypoxia lead to

Answer 10

brain death

permanent brain damage

Question 11

what are most cases of cerebral hypoxia caused by

Answer 11

sudden changes in brain oxygen levels

Question 12

what can the body normally do

Answer 12

respond to mild gradual changes in blood oxygen with little or no noticeable effect on brain fxn

Question 13

where does the brain receive its blood its blood from

Answer 13

the carotid and the vertebral

Question 14

how much of the brain’s blood supply comes from the carotid

Answer 14

80%

Question 15

how much of the brains blood supply comes from the vertebral

Answer 15

20%

Question 16

where do the carotid and vertebral arteries arise from

Answer 16

aortic arch

Question 17

arising from the aortic arch

Answer 17

2 common carotid arteries (extracranial)

–> gives rise to external and internal carotid

2 vertebral arteries