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Circulatory System in Animals Regents Biology 2008- 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 _______________________ Circulatory System Organ ______________ Tissues & cells ______________ ______________ ______________ ______________ ______________ ______________ ______________ Regents Biology 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 = ________ atria empty into ventricles Cardiac Cycle How is this reflected in blood pressure measurements? chambers begin to fill pump (peak pressure) __________________ fill (minimum pressure) 110 ______ 80 Regents Biology ventricles pump Measurement of blood pressure hypertension = (high blood pressure) Regents Biology if top number > 150 or if bottom number > 90 Have a heart? Ask Questions!! Regents Biology 2006-2007