Hormones come in three categories. blank circulate in the blood and act at sites distant from their origin; blank pass through ducts; and blank act on their local tissue environment.

paracrines
exocrines
endocrines

ENDOCRINES circulate in the blood and act at sites distant from their origin;

EXOCRINES pass through ducts;

and PARACRINES act on their local tissue environment.

Explanation:

Exocrines are known for producing external secretions that are released through a duct, usually into the digestive system or the skin

Endocrine are known for producing internal secretions called HORMONES that are transported around the body by the bloodstream. They are also called ductless glands.

Paracrines are known for producing hormones that act on his immediate location or producing gland

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