Glands that secrete hormones do that into the blood, not into ducts. Hormones are not secreted into ducts. glands that secrete into ducts are called exocrine glands. Glands that secrete hormones are endocrine glands.
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Endocrine glands are ductless glands that secrete hormones into the bloodstream. Examples include the pituitary gland, thyroid gland and parathyroid glands.
Harmones