Lust 2

Question 1

Artery vs Arteriole vs capillary vs venule vs vein

Answer 1

• Artery: (Aorta=Highest velocity)
  
  • 2nd largest diameter (behind vein) -
  • thickest wall
  • Composed of:
    
    • Endothelium
    • Elastic tissue
    • Smooth Muscle (most)
    • Fibrous Tissue
  • Fxn: Bulk fluid transfer, can handle pressure
• Arteriole
  
  • Diameter-3rd largest
  • Wall thickness-3rd thickest
  • Composed of:
    
    • Endothelium
    • Smooth Muscle
  • Fxn: regulate resistance
    
    • largest drop in pressure
• Capillary:
  
  • Diameter- smallest
  • Thickness: smallest
  • Composed of:
    
    • Endothelium ONLY
  • Fxn: Gas/Nutrient exchange
    
    • Greatest cross-sectional area
• Venule:
  
  • Diameter: 4th largest
  • width: 4th
  • contain:
    
    • endothelium
    • fibrous tissue
  • Fxn: Capacitance/volume storage
• Vein: (Vena Cava)
  
  • Diameter: Largest
  • Width: 2nd
  • Contain:
    
    • Endothelium
    • Elastic Tissue
    • Smooth Muscle
    • Fibrous tissue
  • Fxn: Capacitance/volume storage