open circulatory system

• type of fluid


  haemolymph
• pump


  elongated tube
• vessels


  no capillary system
• pathway of fluid


  haemolymph pumped from "heart" to open ended vessels
• contact with cells


  haemolymph directly bathes organs/tissues and nutrients directly delivered to cells
• prescense of interstitial fluid

  no
• pressure


  low, hamelymph exits vessels and pressure drops
• efficiency of flow


  slow and inefficient delivery of nutrients
• examples of animals


  anthropods and molluscs
• transportation of gases


  not transported
• activity levels


  low and also smaller