Which of the Following Statements Regarding Circulatory Systems Is True

question 29

Multiple Choice

Which of the following statements regarding circulatory systems is true?

• A) The smallest blood vessels in the body are veins.
• B) A circulatory system is necessary in any animal whose body is too large or too complex for vital chemicals to reach all parts of the body by diffusion.
• C) Materials are exchanged directly between the blood and body cells.
• D) Veins carry blood away from the heart to body organs and tissues.

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