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1.
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Secreted by exocrine or ducted glands.
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Secreted by endocrine or ductless glands.
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2.
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They are catalytic in chemical reactions.
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They do not catalyze specific chemical reactions.
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3.
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They are secreted in an organ where they carry out their function.
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They are secreted in an organ other than where they carry out their function.
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4.
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They are not secreted directly into the blood stream.
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They are released directly into the blood stream.
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5.
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They are not used in metabolism but as catalyst.
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They are used in metabolism.
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