-1. Which of the flowing gland secretes substances through a duct opening in a gland onto an external or internal body surface?
A. Endocrine gland
B. Exocrine gland
C. Pituitary gland
D. Sweat gland
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Answer:B.exocrine gland
It is important to distinguish between an endocrine gland, which discharges hormones into the bloodstream, and an exocrine gland, which secretes substances through a duct opening in a gland onto an external or internal body surface. Salivary glands and sweat glands are examples of exocrine glands.