BIO 205 Test #3 Heart and Blood Vessels.txt

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  1. Cardiovascular System
    • Heart: Pumps blood
    • Blood vessels: Transports blood
    • Blood: Circulating fluid
  2. Circulation
    • Closed system
    • Blood is always within blood vessels or heart
    • Brings nutrients
    • Removes wastes
    • One way system
    • Two circuits:
    • Pulmonary: heart and lungs
    • Systemic: heart and everything else except lungs
  3. Blood Vessels
    • Artery: Carries blood AWAY from heart named for organ it feeds
    • Capillary: Site of exchange between blood and extracellular fluid
    • Vein: Carries blood TOWARD heart named for organ it drains
    • Artery?Arteriole?Capillary?Venule?Vein
  4. Blood Vessel Structure: Capillaries
    • All single layer epithelial tissue
    • Simple squamous for gas to pass through it
    • Very small that red blood cells have to travel �single file�
  5. Blood Vessel Structure: Arteries and Veins
    • 3 Layers:
    • Epithelium on the inside (endothelium) (innermost layer)
    • Smooth muscle and elastic tissue can get bigger or contract down (middle layer)
    • Outer layer: connective tissue
  6. Arteries
    • More elastic to expand and let the blood pass through
    • Much thicker, smooth muscle layer to contract and raise blood pressure
    • Small opening
  7. Veins
    • Less muscle (walls are thinner)
    • Lumens are large
    • Valves � prevents backflow (to help blood return to the heart)
    • Contain most of our blood (70% of blood in veins)
    • Skeletal muscle contract and push the blood upward the heart (keeping you from fainting)
  8. Varicose Veins
    Destroyed valves and nothing to keep from pooling
  9. Heart
    • Substernal location
    • Pericardial sac contains heart
    • Heart muscle=myocardium
    • Cells branches; striates; intercalated disks
  10. Heart anatomy
    • Valve (upside down parachute)
    • -prevents blood from going back to aorta
    • -muscles are called papillary muscle and chordae tendinae
  11. Cardiac Contractions
    • Systole = contraction
    • �Lub�
    • Blood leaves ventricle
    • Blood enters pulmonary artery and into the aorta
    • Diastole = relaxation
    • �Dub�
    • Blood leaves atrium
    • Blood enters ventricle
  12. Electrical System of Heart
    • SA node: start impulse
    • AV node: stimulated and sends signal going down that septum (what separates the left and right atrium)
    • Bundle of His: too thick
    • Bundle Branches
    • Purkinje Fibers
  13. Normal resting pulse
    60-80 beats per minute
  14. Blood Pressure
    • Outwards pressure of blood against blood vessel walls
    • Depends on blood flow from the heart and inward resistance of blood vessel walls
    • Normal: Under 120/ Under 80
    • Pre-hypertension: 120-139/80-89
    • Hypertension (High Blood Pressure): 140 and above/90 and above
  15. Blood Vessels: Blood Pathways
    • Pulmonary Circulation: to and from lungs
    • Systemic: Circulation: to and from rest of body
    • From body (blue), from lungs (red)
  16. Systemic Circulation
    • Coronary Blood Flow: Right coronary artery; left coronary artery
    • Cardiac veins, not coronary veins
    • Coronary sinus (space filled with blood): back side of heart to pump blood to atrium
  17. Superior Vena Cava
    Blood from head, neck, upper extremities
  18. Inferior Vena Cava
    • Blood from abdomen/pelvis
    • Blood from lower extremities
  19. Hepatic Portal System
    • Venous blood travels from GI tract to liver � Nutrient rich; oxygen poor; possible toxins
    • Then travels from liver to inferior vena cava
  20. Aneurysms
    • Weakened blood vessel wall
    • Out pouching at site of weakness
Card Set:
BIO 205 Test #3 Heart and Blood Vessels.txt
2012-04-16 22:09:17

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