Table of Contents
What are acini in salivary glands?
Saliva is produced in and secreted from salivary glands. The basic secretory units of salivary glands are clusters of cells called an acini. These cells secrete a fluid that contains water, electrolytes, mucus and enzymes, all of which flow out of the acinus into collecting ducts.
What does serous acini consist of?
serous acini – contain only serous cells and are generally spherical. mucous acini – contain only mucous cells and are generally tubular. mixed (or sero-mucous) acini -contain a mixture of serous and mucous cells.
What is released by serous acini?
The parotid gland (PG) is mainly composed of serous acini-secreting α-amylase-rich saliva [2]. The sublingual gland (SL) secretes mucous, a viscous solution rich in mucins [3,4,5].
What does the acini of the pancreas produce?
Pancreatic acinar cells secrete pancreatic fluids. This fluid contains digestive enzymes that are released into the small intestine to break down proteins, carbohydrates, fats, and nucleic acids.
Which salivary gland is serous?
The parotid gland
The parotid gland (Fig. 7.14) is predominantly a serous salivary gland. It is situated below the external auditory meatus and extends on to the ramus of the mandible. It lies on the masseter, and the sternocleidomastoid.
Which of the salivary glands is composed of serous acini but has no mucous acini?
The parenchyma of the parotid consists exclusively of serous cells (no mucous cells). The parotid gland has structure and appearance similar to the pancreas (i.e., the pancreas is also a compound, acinar, serous, exocrine gland).
What is serous saliva?
Water is taken up by the cells from the bloodstream and the resulting saliva secreted is isotonic. The serous cells produce serous saliva which is thin, watery and is composed of zymogen granules and contains more proteins, while mucous cells produce thick, viscous saliva containing mucopolysaccharides and mucin.
What does a serous gland secrete?
Serous glands produce a watery secretion; sweat glands of mammals are of this type. Sebaceous glands secrete oil, ceruminous glands secrete wax, mammary glands secrete milk, poison glands secrete various toxins, and scent glands secrete a variety of odoriferous substances.
Where do acinar cells secrete to?
Pancreatic acinar cells synthesize and secrete almost all the digestive enzymes active in the lumen of the small intestine which are necessary for nutrient digestion. Both synthesis and secretion are highly regulated over both short and long time frames to insure an appropriate supply of digestive enzymes.
What are pancreatic acinar cells and why are they called that?
What are pancreatic acinar cells and why are they called that? Pancreatic acinar cells are cells in the pancreas that create, store, and release digestive enzymes. They are named after the Latin word acinus which means “grape.” Acinar cells take on a grape cluster formation within pancreatic tissue.
Where are serous glands found?
Serous glands are most common in the parotid gland and lacrimal gland but are also present in the submandibular gland and, to a far lesser extent, the sublingual gland.
Which salivary gland produces only serous secretions?
What is the parotid gland? The parotid glands produce a type of saliva that is “serous” which means it’s more watery and thin. It is has the protein Amylase that helps begin the process of starch digestion.
Which gland is serous and mucous?
Salivary glands
Salivary glands produce saliva, a watery mixture of enzymes and mucus. The enzymes and the mucus are produced by two distinct cell types, called serous cells and mucous cells.
What is difference between mucous and serous?
Mucus is a thick, clear, and somewhat slimy substance. Serous secretion is a more liquid opalescent fluid composed of water and proteins, such as the digestive enzyme amylase.
What does the pancreatic acini secrete?
Ninety percent of the pancreas is composed of acinar cells which secrete digestive enzymes such as trypsin, chymotrypsin, and amylase for digestion of food in the small intestine.
What is produced by the acinar cells of the pancreas?
The exocrine cells (acinar cells) of the pancreas produce and transport chemicals that will exit the body through the digestive system. The chemicals that the exocrine cells produce are called enzymes. They are secreted in the duodenum where they assist in the digestion of food.
What is the difference between the salivary gland and pancreas?
Note that in the salivary gland the epithelium of the large ducts is pseudostratified or stratified, whereas in the pancreas the large ducts are lined by a simple epithelium. Identify serous and mucous acini.
What do the serous salivary glands secrete?
These serous salivary glands also secrete α-amylase, an enzyme that hydrolyzes α-1,4-glycosidic linkages in starch. The submandibular glands lie under the mandible and consist of a mixture of serous- and mucin-secreting cells. The sublingual glands lie under the tongue and are also a mixture of serous- and mucin-secreting cells.
What type of Acini is found in the sublingual glands?
The type of acini found in the sublingual glands is the subject of some dispute. Some individuals believe that it is a mixed gland, containing both serous and mucous acini, while others say that it is purely mucous. In the instance where it is believed to be mixed, authors have stated that the gland is predominantly mucous in nature.
What is the difference between salivary gland and sublingual gland?
Salivary Glands. The submandibular gland is composed of serous acini and mucous cells, and secretes saliva that contains more mucous than that of the parotid. The sublingual gland is composed primarily of mucous acini, and secretes thicker, mucoid saliva.