Mucin is secreted by________ glands, which combines with water to form a thick and sticky product. ________ glands produce a relatively watery fluid.
A. merocrine; holocrine
B. serous; mucous
C. apocrine; mixed
D. endocrine; exocrine
E. mucous; serous
Answer: E
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Fill in the blank(s) with the appropriate word(s).