Systems of transport within bodies Circulation Hannah Nevins
Bio 1b Spring 2009
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Transportation to and from cells Nutrients e.g. fatty acids,
glucose Metabolites wastes Hormones signaling cells, organs Gases
O2, CO2 How are gases carried?
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Circulatory System Components: Circulatory fluid carry solutes,
gases, immune cells, RBCs Vessels roads for transport Pump to move
fluid Valves to keep flow unidirectional (why?)
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Cell Types: Red & White
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Components of (vertebrate) blood
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Simple Circulation: Ciliated Systems Bodies
Amphibians & some Reptiles Two atria & 1 ventricle
Blood mixed in ventricle Greater systemic pressure = > higher
activity levels Heart gets fresher blood -Which of these has a
greater density of skin capillaries? Why?
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Variations in the circulatory system:
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Four-chamber heart: Crocodiles, Birds and Mammals No mixing of
oxygenated and deoxygenated blood What is the advantage of
this?