Video 8 Pulmo Gas Exchange P2

Question 1

why is the V/Q ratio so important

Answer 1

It determines the gas exchange in every part of the lung

Question 2

What would decrease the V/Q ratio? increase?

Answer 2

airway obstruction
blood flow obstruction

Question 3

T/F: Ventilation increases as we go up the lung

Answer 3

False; decreases

Question 4

Why is there a higher pH at the top of the lung?

Answer 4

The PCO2 is lower at the top of the lung

Question 5

Compare the PO2 of the top of the lung to the bottom of the lung

Answer 5

It is much higher at the top of the lung

Question 6

What is this picture depicting?

Answer 6

A low VQ ratio causes arterial blood to almost have the same oxygen concentration as mixed venous blood (16). A high VQ ratio causes arterial blood to have a slightly higher O2 concentration (20)

Question 7

What is this picture depicting?

Answer 7

V/Q ratio distribution is about 1, as ventilation should be about equal to perfusion

Question 8

What disease process would this graph depict and why?

Answer 8

chronic bronchitis; it is an airway disease therefore blood flow is adequate but ventilation is not

Question 9

Suppose arterial PO2 = 50 and PCO2 = 60 mmHg
Is ventilation perfusion inequality present or is there just hypoventilation?

Answer 9

This patient has V/Q inequality