Where do endocrine glands secrete?
plasma Chemical energy Energy. lungs heart Energy alveoli bloodstream
A B C D E F G H
Endocrine glands secrete directly into the blood.
endocrine glands secrete directly into the bloodstream
Where do endocrine glands secrete? (A) plasma (B) Chemical energy (C) Energy. (D) lungs (E) heart (F) Energy (G) alveoli (H) bloodstream