Transcription of circulatory and respiratory systems
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circulatory and respiratory systems
1 The circulatory and respiratory systems Chapter 49 2 Invertebrate circulatory systems Sponges, Cnidarians, and nematodes lack a separate circulatory system -Sponges circulate water using many incurrent pores and one excurrent pore -Hydra circulates water through a gastrovascular cavity (also for digestion) -Nematodes are thin enough that the digestive tract can also be used as a circulatory system 3 Invertebrate circulatory systems Larger animals require a separate circulatory system for nutrient and waste transport -Open circulatory system = No distinction between circulating and extracellular fluid -Fluid called hemolymph -Closed circulatory system = Distinct circulatory fluid enclosed in blood vessels & transported away from and back to the heart 2 4 5 Vertebrate circulatory systems Fishes evolved a true chamber-pump heart -Blood is pumped through the gills, and then to the rest of the body 6 Vertebrate circulatory systems 3 7 Vertebrate circulatory systems The advent of lungs in amphibians required a second pumping circuit.
The Circulatory and Respiratory Systems Chapter 49 2 Invertebrate Circulatory Systems Sponges, Cnidarians, and nematodes lack a separate circulatory system -Sponges circulate water using many incurrent pores and one excurrent pore -Hydra circulates water through a
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