4_26_07 - Cardio-vascular System Thursday, April 26, 2007...

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Cardio-vascular System Thursday, April 26, 2007 9:40 AM Cardiovascular system General overview Cardiac cycle Blood vessels Mean arterial blood blood See Fig 42.3 Open and Closed Circulatory Systems Hemolymph Interstitial fluid= fluid around cells = lymph See fig 42.4 Vertebrate circulatory systems Blood slows through the capillaries allowing for exchange of nutrients/waste and oxygen/ carbon dioxide Blood speeds up again after capillaries as it travels back to the heart. Lose a lot of blood pressure as it travels through the capillaries Advantage of two circuit vascular system is that it allows blood pressure to the body to be maintained. Three chambered heart is a disadvantage because oxygenated and deoxygenated blood mixes in the vetricles Look at Evolution of: Open (Insect) --> Closed system (vertebrate) One circuitry heart (fish) --> two circuitry heart (amphibians) One ventricular heart (amphibians/reptiles) --> two ventricular heart (mammals and birds) Heart: Know main arteries and veins Pulmonary circuit
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4_26_07 - Cardio-vascular System Thursday, April 26, 2007...

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