Lecture 11

Question 1

Order of pulmonary structures after mouth

Answer 1

1. Pharynx
2. Larynx
3. Trachea
4. Bronchi
5. Bronchioles
6. Alveoli

Question 2

What pressure is higher: Intrapleural or intrapulmonary?

Answer 2

Intrapulmonary: 760mmHG
(Intrapleural is 756mmHg)

Question 3

Minute ventilation (VE) equation

Answer 3

VE= RR x Vt
RR= Respiratory rate
Vt= Tidal volume

Question 4

Alveolar ventilation (VA) equation

Answer 4

VA= RR x (Vt-VD)
VD= Dead space ventilation

Question 5

Does VD increase or decrease as exercise intensity increases?

Answer 5

VD decreases (non-perfused alveoli are now perfused)

Question 6

Atmospheric pressure

Answer 6

752mmHg

Question 7

How to calculate partial pressure

Answer 7

% concentration of specific gas (F) x total pressure (P)

Question 8

PO2 and PCO2 pressure cycle

Answer 8

Atmospheric: PO2= 159mmHg, PCO2= 0.3mmHg
Alveolar/Arterial: PO2= 100mmHg, PCO2= 40mmHg
Tissue/Venous: PO2= 40mmHg, PCO2= 46mmHg

Question 9

Is air flow to alveoli the same as blood flow to the alveoli?

Answer 9

Yes. VA=Q