Final answer:
The secretion of tears, milk, sweat, and saliva is a function of (a) epithelial tissue, which forms the secretory glands in the body.
Step-by-step explanation:
The secretion of tears, milk, sweat, and saliva are functions primarily associated with epithelial tissue. This type of tissue includes the cells that form the secretory glands of the body. The exocrine glands, such as those that produce tears (lacrimal glands), milk (mammary glands), sweat (sweat glands), and saliva (salivary glands), release their products through ducts and are derived from epithelial tissues.
These glands can be classified according to their secretion method into merocrine, apocrine, and holocrine types. For example, salivary glands can be serous, mucous, or mixed in nature.
The watery component of saliva with enzymes like alpha amylase comes from serous cells, while the mucous component rich in the glycoprotein mucin comes from mucous cells.