Active Regulation Of Ventilation And Perfusion

Question 1

ANS

Answer 1

Alpha receptors predominate in pulmonary and sympathetic primarily causes vasoconstriction

Minor

Question 2

Hypoxia induced vasoconstriction

Answer 2

Most important factor influencing pulmonary vascular tone
Reduces blood flow to poorly ventilated alveoli and minimize blood shunting

Alveolar O2 conch dictates vasoconstriction

Question 3

V/Q

Answer 3

Lowest in base

High V/Q wasted O2, increase physiological dead space, ventilation but no perfusion, pulmonary embolism
Low V/Q not enough ventilation for perfusion, shunted blood