Which of the following glands is an exocrine gland?

Question

BlackTom AI · Accepted Answer

Question recap: Which of the following glands is an exocrine gland? Options: Parotid gland; Thyroid gland; Parathyroid gland; Thymus gland.
Option 1: Parotid gland. This is the correct choice because the parotid gland is a salivary gland that secretes saliva into the oral cavity via ducts, classifying it as an exocrine gland.
Option 2: Thyroid gland. The thyroid releases thyroid hormones directly into the bloodstream, without a duct, so it is an endocrine gland rather than exocrine.
Option 3: Parathyroid gland. Like the thyroid, the parathyroid glands secrete hormones (notably parathyroid hormone) into the bloodstream, making them endocrine glands.
Option 4: Thymus gland. The thymus produces hormones involved in immune development and secretes them into the bloodstream, which also designates it as an endocrine gland.
In summary, the distinguishing feature is ducted secretion to outside the gland-system; only the parotid gland employs ducts to deliver saliva externally, while the others release hormones into the circulatory system.

Which of the following glands is an exocrine gland?单项选择题

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