It has been suggested that the lymphatic system evolved when animals became larger and the hydrostatic pressure in their circulatory systems rose. Explain how this suggestion is consistent with the function of the lymphatics-how does high blood pressure make lymphatic function essential? Also, what other advantages were gained by animals that developed lymphatic systems?
What will be an ideal response?
Higher blood pressure results in more filtration at capillary beds, so much so that reabsorption by osmosis is inadequate to maintain plasma volume. Lymphatics' role in fluid balance would be consistent with the hypothesized initial adaptation. The other main advantage of the slow-flowing lymphatic system is immune surveillance against pathogenic microorganisms. Like airport security lines, the slow screening prevents harmful agents from having widespread effects.
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