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5. How do the circulatory system and the endocrine system interact in helping to maintain homeostasis in humans?
A. The endocrine system produces hormones that are transported by the circulatory system to target cells when changes are needed.
B. The circulatory system provides a way to transport cellular waste products to the endocrine system, which disposes of them.
C. The endocrine system provides a storage site for excess raw materials needed by cells, and the circulatory system provides a means for transporting them.
D. The circulatory system signals to target cells in the endocrine system when changes need to be made to maintain balance in the body.