Secreted by exocrine or ducted glands.
Secreted by endocrine or ductless glands.
They are catalytic in chemical reactions.
They do not catalyze specific chemical reactions.
They are secreted in an organ where they carry out their function.
They are secreted in an organ other than where they carry out their function.
They are not secreted directly into the blood stream.
They are released directly into the blood stream.
They are not used in metabolism but as catalyst.
They are used in metabolism.
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