Multiple choice

An open circulatory system occurs in ____________.

  1. reptiles

  2. man

  3. animals

  4. insects
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Insects have an open circulatory system where hemolymph (blood) is pumped into body cavities called hemocoel, directly bathing the organs. Unlike closed systems, the blood is not confined to vessels throughout most of the body. Reptiles have closed circulation, man has a closed circulatory system, and 'animals' is too broad since most vertebrates have closed systems.

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