There are specialized epithelial glands for secretion of their products. There are two main types: exocrine and endocrine. Exocrine glands secrete their product into a system of ducts that lead ultimately to the exterior of the body. Endocrine glands, in contrast, place their secretions directly into the blood.
Why would a person born with an absence of sweat glands be very susceptible to death by exposure to heat?
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