Oxygen Uptake Flashcards
What is counter current exchhange?
water and blood flow in opposite direction (each unidirectional)
What % extraction does counter current exchange allow?
- 80%
Blood flows from the ____ artery to the ____ artery.
- afferent
- efferent
Water flows from the ____ artery to the ____ artery.
- efferent
- afferent
PO2 moves from ___ to ____
- high to low
How does counter current exchange maximize O2 uptake?
- by maintaining relatively stable (delta)Po2 gradient
What does the delta sign mean?
- difference between 2 lines (on graph)
- never reaches equilibrium
- stable gradient
What does concurrent mean?
- blood and water flow in the same direction
Where does concurrent exchange reach equilibrium?
- 50%
What is lamellar SA (number) correlated with?
- O2 demand and lifestyle
What is lamellar thickness inversely correlated with?
- O2 demand and lifestyle
What is the characteristic of lamella in sluggish fish?
- thick and far apart
What is the characteristic of lamella in active species?
- thin and closer
What is the characteristic of lamella in very active species?
- very thin and close together
What is “osmo”
saltwater solution
Is large gill SA good in salt solution? What do fish do to increase this?
- yes
- re-model gills (fill in lamellar gaps)
What is bad about saltwater solutions?
- ion and water balance
What does gill-remodeling do?
- avoids ion/water flukes
- savings for osmoregulation
What is added during gill re-modelling? What does this do?
- interlamellar cell mass (ILCM)
- increases SA for O2 uptake
An increase in temp =
- decrease in solubility
- decrease in [O2]
- increase in MR and O2 demand
