Countercurrent exchange is evident in CHECK ALL THAT WOULD APPLY the flow of water across the gills of a fish and the blood

Question

Countercurrent exchange is evident in
CHECK ALL THAT WOULD APPLY
the flow of water across the gills of a fish and the blood within those gills.
the flow of blood into and out of the legs of a bird in order to maintain blood temperature
the flow of fluid out of the arterial end of a capillary and that of fluid back into the venous end of the same capillary.
the flow of blood and fluid through the nasal glands of a bird

Kunduz · Accepted Answer

Click to see the answer