quiz 42.5
The sun shining on a tidal pool during a hot day heats the water. As some water evaporates, the pool becomes saltier, causing ___________.
a decreasing in its oxygen content
An oil-water mixture works as an insecticidal spray against mosquitoes and other insects because it ___________.
blocks the openings into the tracheal system
Countercurrent exchange in the fish gill helps to maximize
diffusion
Under identical atmospheric conditions, freshwater _________.
has more oxygen than seawater
Some human infants, especially those born prematurely, suffer serious respiratory failure because of _________.
lung collapse due to inadequate production of surfacant
What would be the consequences if we were to reverse the direction of water flow over the gills of a fish, moving water inward past the operculum, past the gills, then out the mouth? This reversal of water flowing would __________.
reduce efficiency of gas exchange
Countercurrent exchange is evident in the flow of __________.
water across the gills of a fish and the blood within those gills