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InterviewSolution
| 1. |
b. amphibians3. How do fish exchange gases? |
| Answer» <p>Fish use gills for gas exchange.Gills have numerous folds that give them a very large surface area.The rows of gill filaments have many protrusions calledgill lamellae.The folds are kept supported and moist by the water that is continually pumped through the mouth and over the gills.Fish also have an efficient transport system within thelamellaewhich maintains the concentration gradient across the lamellae.The arrangement of water flowing past the gills in the opposite direction to the blood (calledcountercurrent flow) means that they can extract oxygen at3 times the rate a human can</p> | |