closed circulatory system

• type of fluid


  blood
• pump


  muscular heart
• vessels


  capillary system
• pathway of fluid


  blood does not leave vessels
• contact with cells


  blood and interstitial fluid do not mix
• transportation of gases


  are transported
• prescense of interstitial fluid

  yes, between tissues and blood
• pressure


  higher pressure, blood remains in vessels and is forced to circulate by the heart
• efficiency of flow


  efficient delivery of nutrients into tissues
• examples of animals


  birds, mammals
• activity levels


  more active and also larger