Home
Flashcards
Preview
LS2:Gas exchange
Home
Get App
Take Quiz
Create
Surface area is increased by
1.External gills
2.Internal gills
3.Lungs
4.Tracheae
ventilation
active moving of the respiratory medium over the gas exchange
Perfusion
circulating blood over the gas exchange surfaces
Countercurrent flow
1.Fish gills use
-very effective mechanism for removing the maximum amount of oxygen from the water flowing over them
- Countercurrent flow promotes diffusion of a substance (such as oxygen) down its concentration gradient from one fluid (water) to the other (blood)
Lamellae
site of gas excahnge and minimize the diffussion path between blood and water
Afferent blood vessels
bring blood to the gills
efferent blood vessels
take blood away
Tidal
air flows in and out by same path
Tidal volume
the amount of air that moves in and out per breath
-at rest is meaured by a spirometer
The residual volume
the air that cannot be expelled from the lungs
alveoli
the sites of human gas exchange
The affinity of hemoglobin for O2 varies. Three factors are:
1.Hemoglobin composition
2. pH
3.2,3 BPG, lowers the affinity for O2
Author
dante01
ID
158557
Card Set
LS2:Gas exchange
Description
study
Updated
6/13/2012, 10:59:19 AM
Show Answers
Home
Flashcards
Preview