Q. How many of the following substances given in the list below are secreted by exocrine glands?
Saliva, oil, digestive enzymes, thyroxine, FSH, mucus, insulin, earwax.

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Solution:

On the basis of the mode of pouring of their secretions, glands are divided into two categories, namely, exocrine and endocrine glands. Exocrine glands secrete mucus, saliva, earwax, oil, milk, digestive enzymes, and other cell products. These products are released through ducts or tubes. In contrast, endocrine glands do not have ducts. Their products called hormones are secreted directly into the fluid, bathing the gland.
In the given list, insulin, FSH and thyroxine are hormones.