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Circulatory System in Animals Regents Biology 2006-2007 Feeding Energy Needs Why do we need a circulatory system? supplies in _______________________ ______________________ _______________________ ______________________ waste out _______________________ ______________________ need to pick up & deliver the supplies & wastes around the body Regents Biology _______________________ Simpler organisms When your body is only 2-cell layers thick, you can get supplies in and waste out just through ______________ all cells within easy reach of fluid Regents Biology Jellyfish Hydra Complex organisms Circulatory system made up of 3 parts organ _________________ tissues & cells _________________ _____________ _____________ _____________ _________________ _____________ _____________ Regents Biology Circulatory systems All animals have: muscular pump = ________________ tubes = ________________ circulatory fluid = ________________ open hemolymph Regents Biology closed blood Vertebrate Heart 4-Chambered heart ____________ (atrium) ____________________ left atrium collection chamber receive blood __________________ right atrium ____________________ pump blood out Regents Biology right ventricle left ventricle Evolution of circulatory system Not everyone has a 4-chambered heart fish 2 chamber V amphibian 3 chamber A A A V Regents Biology reptiles 3 chamber A V A V birds & mammals 4 chamber A V A V Lub-dub, lub-dub 4 valves in the heart flaps of connective tissue ___________________________ Heart sounds ___________________________ “Lub” SL AV AV force blood against closed AV valves “Dub” force of blood against semilunar valves Heart murmur _________________________________________ blood squirts backward through valve Regents Biology Electrical signals allows atria to empty completely before ventricles contract stimulates ventricles to contract from bottom to top, driving blood into arteries heart pumping controlled by electrical impulses Biology Regents signal also transmitted to skin = ________ Cardiac Cycle ventricles fill How is this reflected in blood pressure measurements? systolic ________ diastolic chambers fill 110 pump (peak pressure) _________________ ________ 80 fill (minimum pressure) Regents Biology ventricles pump Measurement of blood pressure if systolic > 150 hypertension = or (high blood pressure) if diastolic > 90 Regents Biology Have a heart? Ask Questions!! Regents Biology 2006-2007