Compare and contrast internal transportation as conducted by an open and closed circulatory system
Also, identify two animals representative of each type of circulatory system. What will be an ideal response?
Open and closed circulatory systems each provide a mechanism for the internal transport of materials
through the animal body. In open circulatory systems (found in arthropods and most mollusks), the
heart pumps blood (specifically hemolymph) into vessels that have open ends. The hemolymph spills
into cavities collectively called the hemocoel. In the hemocoel the hemolymph bathes the cells and
then re-enters the circulatory system through openings in the heart or through opened-ended vessels. In
closed circulatory systems (found in annelids, echinoderms, and vertebrates), the blood flows through
a continuous system of vessels; a hemocoel is absent. Nutrients, gases, and wastes leave the vessels
through thin-walled capillaries.
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Which of the following statements concerning Toxoplasma infection is CORRECT?
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Fill in the blank(s) with correct word
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