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Lecture 17

Lecture 17. Cardiovascular System The Heart. Size, Shape, Location of the Heart. Size of a closed fist Shape Apex : Blunt rounded point of cone Base : Flat part at opposite of end of cone Located in thoracic cavity in mediastinum. Fig. 22.2. Pericardium. Fig. 22.3. External Anatomy.

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Lecture 17

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  1. Lecture 17 Cardiovascular System The Heart

  2. Size, Shape, Location of the Heart • Size of a closed fist • Shape • Apex: Blunt rounded point of cone • Base: Flat part at opposite of end of cone • Located in thoracic cavity in mediastinum Fig. 22.2

  3. Pericardium Fig. 22.3

  4. External Anatomy • Four chambers • 2 atria • 2 ventricles • Auricles • Major veins • Superior vena cava • Inferior vena cava • Pulmonary veins • Major arteries • Aorta • Pulmonary trunk Fig. 22.5

  5. External Anatomy Fig. 22.5

  6. Heart Valves • Atrioventricular • Tricuspid • Bicuspid or mitral • Semilunar • Aortic • Pulmonary • Chordae tendineae • Papillary muscles Fig. 22.6

  7. Heart Valves Tricuspid valves Bicuspid valves Pulmonary semilunar valves Aortic semilunar valves

  8. Location of Heart Valves Clinical View, pg. 664

  9. Function of the Heart Valves Fig. 22.13

  10. Function of the Heart Valves Fig. 22.13

  11. Review Question Damage to the mitral valve could result in an inefficient flow of blood from the _____________ to the _________________. Pulmonary trunk to right ventricle Right atrium to right ventricle Left ventricle to aorta Right ventricle to left ventricle Left atrium to left ventricle

  12. Blood Flow Through Heart Fig. 23.22

  13. Systemic and PulmonaryCirculation Fig. 23.23

  14. Points to Remember • Heart is size of a closed fist and located in mediastinum beneath rib cage • Heart is enclosed in pericardium with pericardial fluid • Heart has four chambers: two atria and two ventricles • Valves control flow of blood within and out of heart • Heart is part of dual circuits for flow of blood - systemic and pulmonary

  15. Questions?

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