Ventilation

Question 1

Definition:

Answer 1

Movement of gas through tubes

Question 2

Does ventilation involve gas exchange?

Answer 2

NO

Question 3

What happens to the alveoli at the top of the lung at rest?

Answer 3

They are more expanded and filled with air

Question 4

Why does most air fill the alveoli in the lower airways (middle-lower lobes) during inspiration?

Answer 4

Because the alveoli in the upper airways are inflated @ rest

Question 5

When is air distribution more equal?

Answer 5

At higher lung volumes (exercise)

Question 6

What are the dependent airways?

Answer 6

The middle and lower lobes of the lungs

Question 7

When do the dependent airways deflate?

Answer 7

At low volumes (breathing slowly)

Question 8

Zone 1 (of perfusion and ventilation)

Answer 8

No BF
P in alveolus > pulmonary capillary P due to air rising
ABNORMAL

Question 9

Zone 2 (of perfusion and ventilation)

Answer 9

Mid lung when seated
Intermittent BF during systole
Limited BF during diastole

Question 10

Zone 3 (of perfusion and ventilation)

Answer 10

Lower lung when seated
Continuous BF
Capillary P > alveolar P

Question 11

Which zone is abnormal?

Answer 11

Zone 1

Question 12

Minute ventilation

Answer 12

VT x RR

Question 13

Normal WOB

Answer 13

3-5% of total E expenditure to breathe

Question 14

WOB in disease state

Answer 14

25% of caloric expenditure

Question 15

Minute ventilation

Answer 15

500mL (VT) x 15 breaths/min = 750mL/min