Which function is associated with epithelial tissue?

• A. Secreting hormones into the bloodstream
• B. Conducting electrical impulses
• C. Protection, secretion, absorption, excretion, filtration, diffusion, and sensory reception
• D. Transporting oxygen in the blood

Answer: (C)

Epithelial tissue lines surfaces and forms glands, carrying out a wide range of protective and transport-related roles. The best description includes protection, secretion, absorption, excretion, filtration, diffusion, and sensory reception. This captures what epithelial cells do across the body: they shield underlying tissues, secrete substances like mucus or enzymes, absorb nutrients, excrete wastes, facilitate selective movement of substances, and even serve as sensory receptors in specialized epithelia. The other functions point to other tissue systems—conducting electrical impulses is a hallmark of nervous tissue, transporting oxygen is a job of the circulatory system, and secreting hormones into the bloodstream is an endocrine function (though glands formed from epithelium exist, the comprehensive epithelial role is described by the broad list above).