Name the associated exocrine glands of the digestive system. Mention Their Location.
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Answer:
Exocrine Glands
Exocrine 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 Glands
The structure of the exocrine glands is divided into two parts:
- Ductal portion
- Glandular portion
The 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 Glands
They perform the following functions:
Functions Of Exocrine Glands
They perform the following functions:
Regulate body temperature
- Lubrication
- Lactation
- Helps in digestion
- Helps in reproduction
- Helps in digestion
- Helps in reproduction
Also read: Endocrine Glands
Types of Exocrine Glands
The exocrine glands are of three types:
Holocrine Glands
Merocrine or Eccrine Glands
Apocrine Glands
Holocrine Glands
These 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 Glands
The substance is secreted directly into the duct through the cellular channels. There is no rupturing of cell wall involved.
Apocrine Glands
They bud off a part of their cellular cytoplasm and membrane and release the substance into the ductal system.
Examples of Exocrine Glands
Lacrimal 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