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Unit 11 Circulatory System The Heart

Unit 11 Circulatory System The Heart. Hollow, Muscular organ the size of your fist In the chest between the lungs, slightly left. 3 layers of heart wall Endocardium- smooth epithelial lining Myocardium- muscle layer Epicardium/pericardium- outer layer. 1. The Heart.

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Unit 11 Circulatory System The Heart

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  1. Unit 11 Circulatory System The Heart

  2. Hollow, Muscular organ the size of your fist In the chest between the lungs, slightly left 3 layers of heart wall Endocardium- smooth epithelial lining Myocardium- muscle layer Epicardium/pericardium- outer layer 1. The Heart

  3. 2. The 4 chambers of the Heart and the 2 Major Valves • Right Atrium(top rt) • Right Ventricle (bottom rt) • Left Atrium ( top left) • Left Ventricle( bottom left) • Tricuspid valve- between RA and RV • Bicuspid(Mitral) valve- between LA and LV

  4. BICUSPID/MITRAL VALVE • This valve between the LA and LV is important in dentistry because if you have ever had a severe strept infection that turns into Rheumatic Fever- this valve may be damaged. The cells of this valve are shaped similar to the strept bacteria cells. When your body produces ANTIBODIES to fight this invader, the valve cells are also attacked. That is why a health history asks if you have ever had Rheumatic fever, and if you have- you will need to be on an antibiotic BEFORE any dental treatment is done.

  5. VALVES

  6. Trace the path of blood through the HEART • Blood enters the RA through the Vena Cava (vein) • From the RA goes through the Tricuspid valve to the RV • Leaves RV via the Pulmonary artery and goes to Lungs to rid of CO2 and pick up O2 • Back to LA via the Pulmonary vein • From LA to LV through the Bicuspid valve • Out of LV through the AORTA( major artery)

  7. Blood enters the heart on top chambers- the ATRIUM Blood leaves the heart on bottom chambers- VENTRICLES RT side of heart has blood with wastes Left side has only clean oxygenated blood Vena Cava RA Tricuspid valve RV Pulmonary artery Lungs Pulmonary Vein LA Bicuspid valve LV Aorta- to rest of body Path of blood summary

  8. 3. Blood vessels that serve the heart • 2 coronary arteries ( branch off aorta) • Coronary veins empty into coronary sinus that goes to right atrium

  9. 4. Describe the Cardiac conductive system • SA nodes- called the PACEMAKER- are in the RA and are fibers that keep the heart beating • AV nodes- in the lower inside corner of the RA stimulate • Purkinje fibers in the Ventricles

  10. 72 / min Contraction- blood forced out =SYSTOLIC Relaxation- heart fills with blood= DIASTOLIC Lub Dub sound is the valves opening and closing 5. Cardiac Cycle- 1 complete heartbeat

  11. Cardiac output is the volume of blood pumped by the left ventrical into the aorta in 1 minute Depends on needs of the body Ave 5 liters/minute at rest 6. Cardiac Output

  12. The Heart 1.

  13. THE END

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