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11.4 The Cardiac Cycle and Circulation

11.4 The Cardiac Cycle and Circulation. Pages 495-500. Heart Diagram. Heart Facts. Right side of heart pumps blood to the lungs Left side of heart pumps blood to the body. Beats. 100 000 times each day. Pericardium. 2-layered fluid-filled membrane for protection. Coronary blood vessels.

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11.4 The Cardiac Cycle and Circulation

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  1. 11.4 The Cardiac Cycle and Circulation Pages 495-500

  2. Heart Diagram

  3. Heart Facts • Right side of heart pumps blood to the lungs • Left side of heart pumps blood to the body

  4. Beats • 100 000 times each day

  5. Pericardium • 2-layered fluid-filled membrane for protection

  6. Coronary blood vessels • Supplies heart muscle with blood • Meet high O2 demand of heart (10% of total O2)

  7. Pathway of blood • Body right atrium right ventricle pulmonary artery lungs  pulmonary vein  left atrium left ventricle aorta  body

  8. Blood vessels • Heart arteries arterioles capillaries venules veins heart

  9. Valves Semilunar valves between • Right ventricle and pulmonary artery • Left ventricle and aorta Atrioventricular valves between Atria and ventricles Bicuspid (left), tricuspid (right)

  10. Purpose of valves • Valves prevent blood from travelling backwards

  11. Cardiac cycle • Diastole: period of relaxation and filling of the heart • Systole: period of contraction and emptying of the heart

  12. Atria fill, AV and SL valves are closed • AV open, blood spills into ventricles • Atria contract, filling ventricles • Ventricles begin to contract, AV forced shut, SL remain shut. • Ventricles contract, SL forced open, blood pushed into arteries

  13. Sounds lubb-Dubb • lubb…AV valves close as ventricles contract • Dubb…SL valves slam shut as ventricles begin to relax

  14. Myogenic Muscle • Heart beat originates in the muscle tissue itself • Sinoatrial (SA) node (pacemaker) • Atrioventricular (AV) node ( • Purkinje fibres…conducting nerves

  15. Nervous Systems • Sympathetic nervous system (fight or flight) • Parasympathetic nervous system (rest and digest)

  16. Electrocardiograph • ECG P-SA node stimulus QRS complex- stimulus via Purkinje fibres T-recovery period

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