gas exchange

Question 1

gas exchange def

Answer 1

movement of gas between environment and blood

Question 2

solubility in plasma

Answer 2

proportional to partial pressure (Henry law)

Question 3

co2 vs 02 solubility

Answer 3

CO2 dissolves at a much higher rate

Question 4

Co2 vs 02 driving force

Answer 4

much larger for 02 (60-100 vs 46-40)

Question 5

rate of diffusion Co2 vs 02

Answer 5

diffuse at similar rates

Question 6

capilary transit time

Answer 6

.75 sec (normally equilibrium at .3 seconds, so extra time)

Question 7

diffusion limited capacity

Answer 7

CO.

Question 8

perfusion limited diffusion capacity

Answer 8

nitrogen, uptake depends on blood flow

Question 9

diffusion capacity for 02 and CO2 in healthy

Answer 9

perfusion!

Question 10

PA02=

Answer 10

Pi02-PaCo2/.8

Question 11

A-aDO2

Answer 11

Dif in all gas/mixed, means vent and perfusion isn’t perfect. high=problme

Question 12

02 transport

Answer 12

most on hemoglobin, creates pressure gradient for some to diffuse

Question 13

right shift

Answer 13

release/less strong bind of 02 to hemoglobin

Question 14

things that cause right shift

Answer 14

Temp, PH, PCo2, DPG

Question 15

things that cause left shift

Answer 15

CO poisin, NO, fetal hemoglobin, methomeglobonin

Question 16

CO2 transport in blood

Answer 16

disolved, bicarb (70%… in RBC! HCO2/CL transporter), carbamino compounds (24%)