Circulatory System

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  1. Atria
    Chambers in the hear where blood flows from the veins to ventricles. Conctraction here adds to ventricular filling but is not essential for it
  2. Ventricles
    Chambers whose contractions produce the pressures that drive blood through the pulmonary  and systemic vascular systems and back to the heart
  3. Components of the vascular system
    • Arteries
    • Arterioles
    • Capillaries
    • Venules
    • Veins
  4. Arteries
    Low-resistance tubes conducting blood to the various organs with little loss in the pressure. They also act as pressure reservoirs for maintaining blood flow during ventricular relaxation
  5. Arterioles
    Major sites of resistance to flow; responsible for the pattern of blood-flow disrtibution to the various organs; participate in the regulation of arterial blood pressure
  6. Capillaries
    Major sites of nutrient, meabolic end product, and fluid exchange between blood and tissues
  7. Venules
    Sites of nutrient, metabolic end product, and fluid exchange between blood and tissues
  8. Veins
    Low-resistance conduits for blood flow back to the heart. Their capacity for blood is adjusted to faciliate this flow
  9. Plasma
    Liquid portion of blood that contains dissolved nutrients, ions, wastes, gases, and other substances. Its composition equilibrates with that of the interstitual fluid at the capillaries
  10. What are the two circuits that make up the circulatory system?
    • 1) Pulmonary Circulation: from the right ventricle to the lungs and then to the left atrium
    • 2)Systemic Circulation: Left ventricle to all peripheral organs and tissues and then to right atrium
  11. Where does the superior vena cava colelct blood from?
    HEad, NEck, Upper limbs, thorax
  12. Where does the inferior vena cava collect blood from?
    Abdomen, pelvis, lower limbs
Card Set
Circulatory System
Circulatory System
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