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

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Endocrine glands secrete their products (hormones) directly into the blood rather than through ducts. The thyroid gland is a classic example of an endocrine gland. Exocrine glands, on the other hand, secrete their products into ducts, which then empty onto a surface or into a cavity. Sebaceous glands (C) secrete an oily substance called sebum into hair follicles, and ceruminous glands (D) secrete earwax into the ear canal.

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