Glands, such as the thyroid, that secrete their products directly into the blood rather than through ducts are classified as ________.

Question

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Endocrine glands secrete hormones directly into the bloodstream, while exocrine glands secrete their products through ducts to the surface of the body or into body cavities (such as sweat glands or salivary glands). Sebaceous glands secrete oil onto hair follicles, and ceruminous glands secrete earwax in the ear canal.

Glands, Such as the Thyroid, That Secrete Their Products Directly