closed vs open circulatory systems

• Type of fluid (open)

  Haemolymph
• type of fluid (closed)

  blood
• Prescence of interstital fluid? (open)


  no
• Prescence of interstitial fluid? (closed)


  yes
• Pathway of fluid (open)

  • leaves vessels to bathe cells
  • returns back to hear via openings called ostia
• Pathway of fluid (closed)

  • remains in vessels
  • returns to hear via veins
• contact with cells (open)


  direct contact to deliver nutrients
• Contact with cells (closed) 


  No contact

  nutrients and gases first diffuse into the interstitial fluid where they are picked up by the surrounding cells
• Type of pump (open)


  elongated tube circulates the fluid
• type of pump (closed)


  muscular heart
• type of vessels (open)


  no capillary system present
• type of vessels (closed)


  capillary system present
• transportation of gases (open)


  Gases are not transport3d
• transportation of gases (closed)


  gases are transported
• Speed of flow (open)


  fluid flows at slow speed
• speed of flow (closed)


  fluid flows at high speed
• Pressure (open)


  low pressure
• pressure (closed)


  higher pressure
• efficiency of flow, rate of metabolic activity

  slow, inefficient

  animals are generally smaller and less active
• efficiency of flow, rate of metabolic activity (closed)


  efficient

  animals are generally larger and more active
• examples (open)


  arthropods, molluscs
• examples (closed)


  reptiles, amphibians, mammals