b Superior vena cava brings blood from the head and upper limbs c Inferior vena

B superior vena cava brings blood from the head and

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b.Superior vena cavabrings blood from thec.Inferior vena cavabrings blood from thed.Coronary sinus(posterior surface) bringse.Pulmonary veinsbring blood from the lungs to the left atrium: o2 from right lung o2 from left lunghead and upper limbs.trunk and lower limbs.blood from the myocardium. See Fig 15.11b, page 565.*All of the above deposit their blood into the right atrium!3.Other feature:a.Note the presence of the ligamentum arteriosum,which is a15-8
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CHAPTER 15: CARDIOVASCULAR SYSTEM: THE HEARTremnant of the fetal ductus arteriosus. See Figure 15.11a, page565, however it is not labeled in this figure.15-9
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CHAPTER 15: CARDIOVASCULAR SYSTEM: THE HEART15.2THE HEARTG.Paths of Blood through the Heart and Lungs (Pulmonary Circuit)See Fig 15.9, page 564 and Fig 15.1, page 558.1.right atrium (deoxygenated blood)(tricuspid valve)2.right ventricle(pulmonary semi-lunar valve)3.pulmonary trunk4.pulmonary arteries5.capillaries (alveoli) in lungs6.pulmonary veins7.left atrium(bicuspid or Mitral valve)8.left ventricle(aortic semi-lunar valve)9.ascending aorta*Note how the ascending aorta arches over the pulmonary trunk and headsdownward forming the thoracic aorta and abdominal aorta.H.Blood Supply to the Heart:Coronary Circulation (i.e. Pathway throughmyocardium or how the heart muscle itself is supplied with oxygenated blood).See Fig 15.13, page 566.1.ascending aorta (oxygenated blood)2.coronary arteries (1st and 2nd branch of aorta)a.left coronary arteryb.right coronary artery*Definition: Anastomoses= connections between 2 or more branches ofarteries that supply the same region with blood. oprovide alternate routes for blood to reach a particularregion omany in heart. See Fig 15.12, page 566.*See box on page 564: re angina pectoris and myocardial infarction.3.capillaries in myocardium (exchange of gases)4.cardiac veins (deoxygenated blood)a.great cardiac veinb.middle cardiac vein5.coronary sinus6.right atrium15-10
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CHAPTER 15: CARDIOVASCULAR SYSTEM: THE HEART15.2THE HEARTI.Summary of Pulmonary, Coronary and General Systemic Circulations15-11
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CHAPTER 15: CARDIOVASCULAR SYSTEM: HEART ACTIONS15.2THE HEART J.The Cardiac Cycle: 1.IntroductionThe heart works in a coordinated fashion as a dual pump, where the atriaand ventricles alternately contract (systole) and relax (diastole). Thecardiac cycle includes all of the events associated with one heartbeat.2.The heart works as a dual pump, where the atria and ventriclesalternately contract (systole) and relax (diastole).a.When the two atria are in systole pumping blood into theventricles, the two ventricles are in diastole, filling with blood.b.When the two ventricles are in systole pumping blood intothe arteries, the two atria are in diastole, filling with blood.3.Blood flows from areas of high pressure to areas of low pressure.
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