Select from: (a). plasma; (b). Chemical energy; (c). Energy.; (d). lungs; (e). heart; (f). Energy; (g). alveoli; (h). bloodstream;
Q: Fact 1: Endocrine hormones travel throughout the body in the blood. Fact 2: Endocrine glands secrete directly into the blood. Given the two facts above, where do endocrine glands secrete?
A:
(h).