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Circulatory System in Animals

Circulatory System in Animals. Feeding Energy Needs. Why do we need a circulatory system? supplies in _______________________ ______________________ _______________________ ______________________ waste out _______________________ ______________________

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Circulatory System in Animals

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  1. Circulatory Systemin Animals

  2. 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 • _______________________

  3. Circulatory System • Organ • ______________ • Tissues & cells • ______________ • ______________ • ______________ • ______________ • ______________ • ______________ • ______________

  4. Vertebrate Heart • 4-Chambered heart • ____________ (atrium) • ____________________ • collection chamber • receive blood • __________________ • ____________________ • pump blood out leftatrium rightatrium rightventricle leftventricle

  5. Evolution of circulatory system Not everyone has a 4-chambered heart fish amphibian reptiles birds & mammals 2 chamber 3 chamber 3 chamber 4 chamber V A A A A A A A V V V V V

  6. Lub-dub, lub-dub • 4 valves in the heart • flaps of connective tissue • ___________________________ • Heart sounds • ___________________________ • “Lub” • force blood against closed AV valves • “Dub” • force of blood against semilunar valves • Heart murmur • _________________________________________ • blood squirts backward through valve SL AV AV

  7. Electrical signals • heart pumping controlled by electrical impulses • signal also transmitted to skin = ________ stimulates ventricles to contract from bottom to top, driving blood into arteries allows atria to empty completely before ventricles contract

  8. atria emptyinto ventricles Cardiac Cycle How is this reflected in blood pressure measurements? chambers beginto fill pump(peak pressure) __________________ fill(minimum pressure) 110 ______ 80 ventriclespump

  9. Measurement of blood pressure if top number > 150 or if bottom number > 90 hypertension =(high blood pressure)

  10. Have a heart?Ask Questions!!

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