開かい放ほう血けっ管かん系けい

noun

open circulatory system; open blood-vascular system

Biological term referring to a circulatory system where blood (hemolymph) is not always contained within vessels, as seen in arthropods and most mollusks.

• 昆こん虫ちゅうは開かい放ほう血けっ管かん系けいを持もつ。

  Insects have an open circulatory system.

• 開かい放ほう血けっ管かん系けいでは、血けつ液えきは組そ織しきの間あいだを直ちょく接せつ流ながれる。

  In an open circulatory system, blood flows directly through the tissues.