Final answer:
Endocrine glands secrete hormones into the bloodstream and are ductless, while exocrine glands secrete through ducts to surfaces or into body cavities, such as with sweat, saliva, or digestive enzymes.
Step-by-step explanation:
Endocrine glands empty their products into bloodstream and are referred to as ductless glands, while exocrine gland secretions empty into ducts or onto surfaces.
Exocrine glands, such as sweat glands and salivary glands, release their contents through a duct that leads to the epithelial surface. Secretions like mucous, sweat, saliva, and breast milk are typical examples of what is produced by these glands. They provide essential functions like hydration of the skin or digestion in the case of saliva and gastrointestinal enzymes.
In contrast, endocrine glands release hormones into the interstitial fluid, which then diffuse into the bloodstream. This system of glands is a significant regulatory system essential in coordinating various body responses. The anterior pituitary, thymus, adrenal cortex, and gonads are examples of endocrine glands.