Cardiovascular System - Function Revised 2014

Cardiovascular system
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Cardiovascular System - Function Revised 2014

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Slide Content
  1. Cardiovascular System

    Slide 1 - Cardiovascular System

    • Function
  2. Heart Action

    Slide 2 - Heart Action

    • Systole: Contraction of the heart
    • Diastole: Relaxation of the heart
    • Watch the action of the atria and ventricles…
    • http://www.youtube.com/watch?v=waOSUpEHPQs
  3. The heart is two separate “pumps”

    Slide 3 - The heart is two separate “pumps”

    • Pulmonary Circuit
    • Right side pumps deoxygenated blood to the lungs:
    • Via pulmonary arteries
    • drop off carbon dioxide
    • pick up oxygen
    • Systemic Circuit
    • Left side pumps oxygenated blood to the cells of the rest of the body:
    • drop off oxygen
    • pick up carbon dioxide
  4. Based on the functions of the right ventricles vs. the left ventricle, how do you think their structures differ?

    Slide 6 - Based on the functions of the right ventricles vs. the left ventricle, how do you think their structures differ?

    • Left ventricle must pump blood to the entire body
    • Right ventricle only has to pump blood to the lungs
    • Therefore, walls of the left ventricle are THICKER (more muscle)
  5. StructureFunction!!!

    Slide 8 - StructureFunction!!!

    • What structures in the heart ensure that blood keeps moving forward?
    • VALVES: prevent backflow of blood
    • A-V Valves are attached to walls of the heart via chordae tendineae
    • Prevents inversion of valves
    • Attached to papillary muscles
  6. Papillary muscles

    Slide 9 - Papillary muscles

    • During contraction, these extensions of the myocardium “tug” on the chordae tendinae
    • Prevent valve prolapse/inversion
  7. A bit more on valves…

    Slide 10 - A bit more on valves…

    • Two kinds:
    • Semilunar
    • A-V
    • (Atrioventricular)
  8. Semilunar Valves

    Slide 11 - Semilunar Valves

    • Found at “outlets” of the heart (blood vessels)
    • Pulmonary, aortic
    • Attach at junction; flaps that look like “moons” (i.e. “lunar”)
    • Prevent “suction” of blood back into ventricle
  9. A-V Valves (Atrioventricular)

    Slide 12 - A-V Valves (Atrioventricular)

    • Found at junction between Atria and Ventricles
    • Also known as bicuspid, tricuspid… (or mitral!)
    • Reinforced by chordae tendinae
    • Prevent backflow into atria