Gas exchange

Question 1

what are the 3 mains points of gas exchange

(think big picture)

Answer 1

1. Bring in O2 and load it onto red blood cells
   2.get O2 out into peripheray and dump it off
   3.get CO2 back FROM peripheray to the lungs

Question 2

Where does hemoglobin (Hb) live?

Answer 2

inside Red Blood cells

Question 3

Factors that impact gas exhange

*what are the 5?

Answer 3

1.Partial pressure/pressure gradient
2.Barriers to diffusion
3.Molecule size and viscosity of medium
4.RBC transit time
5.Ventilation/perdusion(Q) rate

Question 4

Factors that impact gas exhange:

Barriers to diffusion…what are they?

Answer 4

-Suractant (fluid inside alveoli)
-Alveolar epithilium
-insertitia space
-capillary basement membrane
-capillary endothelium

Question 5

Factors that impact gas exhange:
Molecule size and viscosity of medium

Answer 5

-CO2 diffuses 2x FASTER than O2 beacause it is more soluble in H20 (even though its larger than O2)

Question 6

Factors that impact gas exhange:
RBC transit time

what is RBC transit time?
whats the rest and whats the max?

Answer 6

-RBC transit time is the time it takes a RBC to dravel down a capillary

rest: .75 seconds
Max exercise: .25 secs

Question 7

How to know if a RBC will have enough time to get saturated with O2?

Answer 7

If time is LESS than .3 seconds than there is not enough time

if time is GREATER than .3 seconds than there IS enough time

.3 seconds is the “goldylocks” time

Question 8

Factors that impact gas exhange:
Ventilation/perfusion (Q) rate

what is it and whats the ideal score

Answer 8

-gas exchnage from alveloi to blood
-idea rate: 1.0

Question 9

Where is lung blood flow the best?

Answer 9

Blood flow is greater at the BOTTOM portion of the lungs