Organisms in which a circulating body fluid is distinct from the fluid that directly surrounds the body's cells are likely to have which of the following?
A)an open circulatory system
B)a closed circulatory system
C)a gastrovascular cavity
D)branched tracheae
E)hemolymph

Question

Quizplus · Accepted Answer

A closed circulatory system provides a distinct circulating body fluid (blood) that is separate from the fluid that directly surrounds the body's cells (interstitial fluid). Organisms with an open circulatory system would have hemolymph, which is not distinct from the interstitial fluid. Gastrovascular cavities are found in cnidarians and platyhelminthes and are used for both digestion and circulation. Branched tracheae are found in insects and are used for gas exchange, not circulation. Hemolymph was mentioned earlier and is not a type of circulatory system, but rather the body fluid found in organisms with an open circulatory system.

Organisms in Which a Circulating Body Fluid Is Distinct from the Fluid