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Circulation human heart shortened and revised


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  • 1. CirculationUnit 11 – Body Systems
  • 2. Circulation Blood travels toevery cell in thebody– Delivers O2,nutrients, energy– Removes wastesjCapillariesof head andarmsPulmonaryarteryAortaSuperiorvena cavaInferiorvena cavaPulmonaryveinCapillariesof right lungCapillaries ofleft lungCapillaries oflower body
  • 3. Circulation in HumansjCapillariesof head andarmsPulmonaryarteryAortaSuperiorvena cavaInferiorvena cavaPulmonaryveinCapillariesof right lungCapillaries ofleft lungCapillaries oflower body 4 chambered heart Double –loop PulmonaryCirculation: blood ispumped from theright side of theheart to the lungs SystemicCirculation: blood ispumped to the body
  • 4. Human Heart Hollow muscular organ Surrounded by a protective sac calledpericardium Myocardium - muscle in the heart walls A septum divides the heart in half Each side has 2 chambers– Atrium (upper) receives blood– Ventricles (lower) pump blood OUT of the heart Valves keep blood flowing in the rightdirection
  • 5. Human HeartMitral (Bicuspid) Valve• Prevents backflow from theleft ventricle into the atriumSeptumRight VentricleTricuspid Valve• Prevents backflow betweenthe right atrium and ventricleRight AtriumPulmonary Artery• Carries deoxygenated bloodfrom heart to the lungsPulmonary Valve• Prevents backflow between theright ventricle and pulmonaryarteryPulmonary Veins• Carries oxygenated blood fromlungs BACK to the heartAortic Valve• Prevents backflow into theleft ventricle from the aortaLeft AtriumLeft VentricleSuperior Vena Cava• Large vein which bringsO2 poor blood from upperbody to the right atriumInferior Vena Cava• Large vein which bringsO2 poor blood from upperbody to the right atriumAorta• Brings oxygenated blood fromthe heart to the rest of the body
  • 6. Blood Vessels
  • 7. Blood Vessels -Veins Veins have valves Return blood to the heart
  • 8. Blood Vessels - Arteries Carry blood Away from the heart Blood is under the highest pressure inthe arteries– Thick muscular walls– Elastic Artery disease may lead to heartattack or stroke
  • 9. Blood Vessels - Capillaries Smallest vessels, only one cell thick Diffusion occurs between capillaries and allcells Gas exchange
  • 10. What is Blood Pressure? Pressure exerted byblood against arterywalls Systolic – forcewhen ventriclescontract Diastolic – force feltwhen ventricles relax Normal 120/80
  • 11. What is Heartbeat? Controlled by the SA Node or “Pacemaker”
  • 12. How is Heartbeat Measured?
  • 13. Lymphatic System Collects fluid that leaks from the blood, andreturns it to the circulatory system Lymph flows through vessels Lymph nodes trap bacteria
  • 14. Lymphatic System Two Organs– Spleen removes oldRBCs– Thymus - site whereT-cells matureSuperiorvena cavaLymphnodesThymusHeartThoracicductSpleenLymphvessels
  • 15. Components of Blood 55% Plasma 45% cellularcomponents– Red Blood Cells(RBC)– White Blood Cells(WBC)– Platelets
  • 16. Components of Blood What does each component look like?What is the structure? What is the function of each component?(plasma, RBC, WBC, platelets) How does structure determine function? Which cells are the most numerous? What is the scientific name for each celltype?
  • 17. Components of Blood Red Blood Cells (Erythrocytes)– Iron containing hemoglobin binds O2– Disc shape increases surface area– Most numerous cell type White Blood Cells (Leukocytes)– Fight infection– Largest blood cell, least numerous Platelets (Thrombocytes)– Release chemicals to clot blood– Small cellular fragments
  • 18. Blood CellsRed Blood Cells White Blood Cells Platelets
  • 19. Blood Types Incompatible blood types will result inagglutination (clumping)
  • 20. Blood TypesA, B, AB,and OOAnti-A &Anti-BNoneOABA, B, ABand ONoneABABB and ABO and BAnti-ABBA and ABO and AAnti-BAACan DonateTo…Can ReceiveBloodFrom…Antibodiesin PlasmaAntigens onRBC’sBlood Type