Neuro

Question 1

Cerebral blood flow regulation

Answer 1

○ Autoregulation (within reason–can’t compensate for SBP <60 or >140) through sensing CO2, H+, and O2
§ Increased CO2 levels causes vasodilation and increased blood flow in brain
§ Increased H+ causes increase in blood flow
Decreased O2 causes increased blood flow

Question 2

Cerebral blood supply

Answer 2

○ Two anterior carotids
Two posterior vertebral arteries

Question 3

Circle of willis

Answer 3

§ The arterial blood supply is connected in this area around the brainstem
This helps maintain blood flow to the brainstem even if one vessel is blocked