Why is an open circulatory system less efficient than a closed circulatory system? A) It is more difficult to deliver O₂ to specific tissues when needed. B) There is no heart to pump the blood. C) Open circulatory systems lack hemoglobin. D) Nutrients cannot be delivered to tissues in an open circulatory system. E) All of the above

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Quizplus · Accepted Answer

In an open circulatory system, the hemolymph (fluid equivalent to blood) bathes the organs directly, making it less efficient to deliver oxygen or nutrients to specific tissues when needed. In a closed circulatory system, blood is pumped by the heart through a network of vessels, which makes it easier to deliver oxygen and nutrients to specific tissues. The other choices (B, C, D) are not correct because there is a heart to pump the hemolymph in an open circulatory system, open circulatory systems do not use hemoglobin, and nutrients can be delivered to tissues in an open circulatory system.

Why Is an Open Circulatory System Less Efficient Than a Closed