Which of the following statements about countercurrent exchange at fish gills is NOT true? Countercurrent exchange at fish gills increases the efficiency of pas exchange between blood and the ervironment. Countercurrent exchange enables extraction of >80% of oxpen content of water Whout countercurrent eachange, the maximum axygen content that my be exacted from water is 60%. Countercurrent exchange makes filly very efficient at extracting onyen, but gills still cannot get adequate gas exchange in air.
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Countercurrent exchange enables extraction of >80% of oxygen content of water Without countercurrent exchange, the maximum oxygen content that may be extracted from water is 60%. Countercurrent exchange makes gills very efficient at extracting oxygen, but gills Show more…
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One advantage of counter current exchange in the gills of a fish, compared to co-current exchange, would be: Counter current exchange has no advantage compared to co-current exchange. It increases carbon dioxide uptake into the gill. It decreases oxygen uptake into the gill. It maximizes oxygen concentration differences across the gill. It minimizes oxygen concentration differences across the gill.
Sri K.
Countercurrent gas exchange in the gills of a fish a. maintains a gradient that enhances diffusion. b. enables the fish to obtain oxygen without swimming. c. means that blood and water flow at different rates. d. allows $\mathrm{O}_{2}$ to diffuse against its partial pressure gradient.
Which of the following statements about the countercurrent exchange of bony fish gills is true? Water and blood flow in the same direction to maximize the efficiency of gas exchange. Water enters through the gill slits and exits through the mouth of the fish. The water adjacent to a gill capillary always holds less oxygen than the blood flowing inside that capillary. The flow of water and blood in opposite directions maximizes the efficiency of gas exchange.
Shveta P.
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