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Heart

Heart. Heart valve replacement surgery. cardiovascular system. Transportation of oxygen, nutrients, cell wastes, hormones = body homeostasis Blood, heart, blood vessels Heart provides the force to move blood. The Heart. Approx. size of closed fist Flanked by lungs

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Heart

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  1. Heart

  2. Heart valve replacement surgery

  3. cardiovascular system • Transportation of oxygen, nutrients, cell wastes, hormones = body homeostasis • Blood, heart, blood vessels • Heart provides the force to move blood

  4. The Heart • Approx. size of closed fist • Flanked by lungs • Lies between sternum and vertebral column (CPR) • Rests on diaphragm • Middle left of thoracic cavity • Apex points downward left; base (broad part of heart) • Inside pericardium

  5. in situ pericardium

  6. chambers • Atria = receiving chambers; • Ventricles = pumps blood out. • Blood flows from body  atria ventricles  to body (2 circuits)

  7. chambers of heart • 2 atria • 2 ventricles

  8. Right atrium • Receives blood from superior and inferior vena cava • Blood passes through tricuspid valve to get to right ventricle

  9. Right ventricle • Tricuspid valve connected by chordae tendinae and then to papillary muscles • Interventricular septum separates ventricles • Blood goes through pulmonary valve into the pulmonary trunkwhich splits into right and left pulmonary arteries

  10. Left atrium • Receives blood from lungs through 4 pulmonary veins • Blood flows through bicuspid valve into left ventricle

  11. Left ventricle • Chordae tendinae anchored by papillary muscles (of bicuspid valve) • Blood passes through aortic valveinto ascending aorta, then arch, and descending aorta • Muscular wall MUCH thicker because it has to pump the same amount of blood a FARTHER distance

  12. Summary questions DON'T WRITE • What is the pericardium? • Where is the tricuspid valve? • What are chordae tendinae? • Which blood vessels deliver blood to right atrium? • Which blood vessels deliver blood to left atrium? • What is the relationship between wall thickness and function of the left ventricle?

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