Lecture 2/27 - Pulmonary Flashcards
Test 2
The pulmonary artery and vein are considered ________ blood
systemic
What is the alveolar pressure of O2?
PAO2 = 104 mmHg
What is the systemic pressure of O2 in the L atrium? Why?
100 mmHg
pulm venous blood is diluted with bronchiolar admixtures
Tissue in the lungs has its own ____________, which makes up ___% of CO. What is the function of this?
circulatory system
1%
Its function is to deliver nutrients to parts of lungs that cant get it from pulmonary blood.
How does age affect PAO2?
It should be 104 mmHg in someone who is in good health and 20 yrs old
This number starts to decrease EVEN WITH PERFECT HEALTH after the age of 20 yo
At what age do your organs start deteriorating?
40 yo
At what age does your PAO2 decrease?
20 yo
What is your PAN2 (nitrogen)?
569 mmHg
Increase minute ventilation = ________ in O2 & __________ in CO2 in regards to PA. How are these numbers for reflected
Increase
Decrease
Reflected in blood gases
T/F: if we increase blood flow to the lungs the alveolar gas pressures will be the same
F
The numbers will be different
What does the dot over an abbreviation mean?
Over a minute
What is the abbreviation for minute ventilation?
V̇E
Technically, what should minute ventilation be?
Tidal volume x RR
VT =
VD + VA
Tidal volume = Dead space ventilation + perfused Aveolar ventilation
Ex) 500 = 150 + 350
V̇E =
V̇D + V̇A
(VD x RR) + (VA x RR)
Ex) 6000 ml = (150ml x 12) + (350ml x 12)
What are the 3 types of dead space? Describe them
- Anatomical: conducting zone in upper airway
- Alveolar dead space: w/i lungs –> alveoli that are not perfused w/ ventilation
- Physiological: combo of anatomical & alveolar dead space
What is an example of Alveolar dead space?
PE
Which type of dead space occurs in unhealthy lungs?
alveolar dead space
When should you have alveolar dead space?
If over the age of 20 and/or bad health
You inhale/exhale 500 cc of indicator gas. What happens to it?
During inspiration:
-150 cc of that gas stays within the anatomical dead space
-350 cc is diluted in the 3L thats already
Expiration:
-150cc of gas (100% indicator) that was in dead space is pushed out
-350cc of diluted mixture from lungs is exhaled
Whats taken in/out are both diluted
In the ________ there is a small amount of gas exchange. This area consist of the ____________
Transitional zone
Respiratory bronchioles
T/F: anatomical dead space has no purpose
F
The 150 cc of air is used to push the other 350cc of air further into the lungs for gas exchange