Exocrine GlandsExocrine glands are the glands of external secretion. These are those that secrete substances on the body surface through a duct. Salivary glands, mammary glands, sweat glands, are some of the exocrine glands.Structure Of The Exocrine GlandsThe structure of the exocrine glands is divided into two PARTS:Ductal portionGlandular portionThe ductal portion is tubular in shape. It is a single, thick, cuboidal cell wall that helps in the movement of the secretion. The duct may be branched or unbranched. It can also be found as a SIMPLE coiled structure.The glandular portion is responsible for the production of the secreted substance. It is a circular or elongated CLUSTER of cells. The cells found in the glandular portion depend upon the substance secreted. For eg; serous cells secrete proteins, mucous cells secrete fluids.Functions Of Exocrine GlandsThey PERFORM the following functions:Functions Of Exocrine GlandsThey perform the following functions:Regulate body temperatureLubricationLactationHelps in digestionHelps in reproductionHelps in digestionHelps in reproductionAlso read: Endocrine GlandsTypes of Exocrine GlandsThe exocrine glands are of three types:Holocrine GlandsMerocrine or Eccrine GlandsApocrine GlandsHolocrine GlandsThese are released by the rupture of the plasma membrane. Produced in the cytoplasm of the cell, these destroy the cells and secrete the product in the lumen.Merocrine/Eccrine GlandsThe substance is secreted directly into the duct through the cellular channels. There is no rupturing of cell wall involved.Apocrine GlandsThey bud off a part of their cellular cytoplasm and membrane and release the substance into the ductal system.Examples of Exocrine GlandsLacrimal Glands– include tear ducts near each eye.Pancreas– Secretes pancreatic juice along with the digestive enzymes into the stomach.Salivary Glands- secretes saliva along with digestive enzymes.Liver- secretes bile that contains salts and digestive substances.Mammary Glands- secrete breast milk.Eccrine Sweat Glands- release salty WATER through perspiration.Also read: Pancreas