Published on Useful concepts.

Glands are groups of cells that separate certain blood substances and use them to produce other substances (secretions).

There are two types of glands: endocrine glands which secrete internally into the blood (secretions are injected into the blood); and exocrine glands, of external secretion (which secrete substances that are not injected into the blood).

Examples of endocrine glands include: sweat glands, salivary glands, lachrymal glands, and pancreas (in its digestive capacity), to name a few.

Secretions from endocrine glands are called hormones and they affect the metabolism of human beings.

They are chemical agents that affect the functioning of the organs of the body.

See the affected gland.

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