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Unformatted text preview: The Animal Circulatory System Animal Circulatory Systems- Look at the phylogeny- Recall what you’ve learned about body plan and animal nutrition: phagocytosis, gastrovascular cavity, alimentary canal- Do you think all animals have a circulatory system? CQ1: Which animals have a circulatory system? Answer: 4, All animals except sponges, ctenophora, cnidarians, and platyhelminthes General Model of Animals with Circulatory System- System of tubes is the level of exchange between the external environment and the surface. - All circulatory systems contain: o Fluid o Tubes/vessels o Pumping device- Open Circulatory System: o have hemolymph instead of blood (not distinct from interstitial fluid)- Closed Circulatory System: o Blood (distinctive from interstitial fluid)- Not all animals that have a circulatory system (CS) have blood - Double Circulation in Vertebrates: o Two circuits of flow: Pulmonary (fluid is coming into lung capillaries, picking up O2 there and being pumped out by the heart into the system) and Systemic. o Capillaries are leaky, exchange happens at the capillaries Blood- Liquid component and cellular components- Plasma is the liquid component o 92% water o Proteins: 5% clotting proteins involved in production of fibrin o Ions o Nutrients: Glucose, amino acids, vitamins o Gases (O2, CO2)- Three main functions of blood: transportation, maintenance, protection.- Blood cells include: o Red blood cells o White blood cells o Platelets Red Blood Cells- Ensure that tissues (and cells) have oxygen for cellular respiration o Reminder: cellular respiration is the primary way that organisms burn glucose to produce ATP. Cellular respiration uses oxygen- Remove CO2 from tissues (cells) o Reminder: CO2 is a by-product of cellular respiration...
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