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Describe how gas gradients arise; apply them to fish
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- Create a hand drawn flow diagram showing how gases enter, travel, and exit the body of the fish. Use keywords and arrows only.SOURCE: Gills are the main site of gas exchange in almost all fishes. The gills consist of bony or cartilaginously stiffened arches that anchor pairs of gill filaments. In sharks, the pairs of gill filaments are separated by a fleshy septum. The numerous, minute lamellae that protrude from both sides of each filament are the primary sites of gas exchange; however, not all the blood flow in the gills is directed to the lamellae. "Nonrespiratory basal blood channels or venolymphatic simuses may carry a significant fraction of the gall blood found that resting rainbow trout perfused approximately 58% of their lamellae with blood. Trout in hypoxic (low dissolved oxygen) water or injected with epinepherine (eg. simulating stress or excitement) perfused more than 70% of their lamellae. Conversely, injections of acetylcholine decreased perfused lamellae to approximately 43%. These results indicate that rainbow trout can increase the number of lamellae that are used in respiration as the…Using Daphnia and grasshoppers as specific examples, compare how aquatic arthropods accomplish gas exchange with how terrestrial arthropods accomplish gas exchange?
- Can you answer all the parts to this question regarding fish A: Describe countercurrent exchange in your own words. B: Describe concurrent exchange in your own words. C: Mammals have dead end sacs called “alveoli” and don’t have the super efficient countercurrent exchange system seen in fish. Why do you think countercurrent exchange is necessary for fish? (hint: think about the difference between where most mammals and fish live).With unidirectional flow, fish can arrange the blood flow in their gills so that they can extract all the oxygen from the water they inhale. Explain how this is achievedExplain some structural and functional features that are common to all gas-exchange surfaces in animals.