Question

What is an example of an apocrine, exocrine, merocrine, and holocrine gland?

Answer 1

Hint: The glands of the body that produce secretions and release them into a body cavity through ducts towards the surface of the body to perform a specific function are known as the secretory glands.

Complete answer:
Apocrine glands are secretive glands that release their cytoplasm in their secretions. They produce extracellular membrane-bound vesicles that are released from the apocrine glands and enter the lumen. These secretions are less damaging. An example of such glands in the mammary glands or breasts that secrete milk.
Exocrine glands are secretory glands that secrete their secretions onto the epithelial surface through a passage or a duct. The exocrine gland comprises a glandular portion that can either be tubular or acinar and a duct portion that can either be branched or unbranched. An example of the exocrine gland is the sweat glands that secrete sweat from the hair follicles in the armpits.
Merocrine glands are those glands that excrete out their secretions through exocytosis. The secretions are released from the secretory cells to the epithelial walled duct present on the surface. Secretions from the merocrine glands are damaging. An example of merocrine glands is pancreatic glands and salivary glands.
Holocrine glands are those glands that secrete into the cytoplasm of the cell and release by the fissure of the plasma membrane. These glands are the most damaging as they destroy the cells that in turn release the secretion of the substances into the lumen. Sebaceous glands of the skin are one example of holocrine glands.

Note:
The endocrine system of the body is used for controlling and coordinating the internal body mechanisms such as reproduction, energy levels, growth and development, change in the stimulus, stress, and response of injuries with the help of a chemical network or hormones. They release hormones into the bloodstream.