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During the period of rest, i. e., no secretion flowing from the duct, and the gland being pale, the gland cells in the acini undergo a change which may be compared with that observed in the cells of the serous salivary glands. The division of the row of cells lining the acinus, into a central granular and outer clear zone, has already been mentioned.
Immediately after very active secretion, the central granular zone is reduced to a minimum, owing to the paucity of granules; and the outer zone occupies the greater part of the cell, the entire substance of which stains readily and looks like ordinary protoplasm. After rest, however, the granules reappear, and after the lapse of a short quiescent period, the inner granular zone has again encroached on the outer, owing to the accumulation of granules which, rapidly increasing, fill the greater part of the cells, and cause them to bulge inward and occlude the lumen of the gland. As digestion proceeds, the cells undergo a slight change in form, so that each individual cell is more distinctly seen, and its angles are retracted, giving a notched appearance to the margin of the acinus. The blood supply during this period is much increased, red arterial blood flowing from the veinlets of the gland. At the same time the granules are diminished in number, escaping at the free central margin of the cells into the lumen, toward which they appear to crowd, leaving the outer zone once more clear and free from granules, while the lumen of the saccule and of the ducts is filled with secretion.
Structural modifications involved in cellular secretion include the presence of a well-developed Golgi apparatus for post-translational modifications of proteins, an extensive endoplasmic reticulum for protein synthesis, and the presence of secretory vesicles for storage and transport of secretory products. Additionally, cells involved in secretion often have specialized secretory granules for the storage and release of secretory products.
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Do lysosomes help in secretion?
Lysosomes are not involved in secretion. Lysosomes are organelles responsible for breaking down and recycling cellular waste and debris. Secretory vesicles are responsible for transporting materials for secretion out of the cell.
Where does secretion occur?
Tubular secretion occurs in the distal convoluted tubes. The secretion also happens in the collecting ducts and also in the proximal convoluted tubule.
Where is sandoval fluid in the human body?
Synovial fluid fills the area near a Synovial joint. The fluid is stringy and has egg like consistency. It lubricates the motion of the bones forming the joint. Other types of joints are cartilaginous joints and fibrous joints. Synovial joints themselves are of various types - such as gliding, hinge, pivot, saddle, ball and socket.
What has 3000 genes?
The human genome has around 3000 genes involved in coding for proteins. These genes are responsible for carrying out various functions within the body, such as producing enzymes, hormones, and structural proteins. Mutations in these genes can lead to genetic disorders or diseases.
What is the function of epithal tissue?
Epithelial tissue serves as a protective barrier against mechanical injury, pathogens, and fluid loss. It is also involved in absorption, secretion, and sensation in various organs and structures throughout the body.
Do lysosomes help in secretion?
Lysosomes are not involved in secretion. Lysosomes are organelles responsible for breaking down and recycling cellular waste and debris. Secretory vesicles are responsible for transporting materials for secretion out of the cell.
Simple cuboidal cells are often involved in?
absorption and secretion in glands and kidney tubules due to their cube-shaped structure that allows for efficient exchange of molecules. They provide a protective lining in various organs such as the liver, thyroid, and pancreas to support their functions.
What is a secretion vesicle?
A secretion vesicle is a membrane-bound organelle within a cell that contains substances such as proteins or hormones that are to be released from the cell. These vesicles are involved in the process of exocytosis, where the contents are expelled from the cell to carry out various functions.
Is connective tissue primarily concerned with secretion?
No, connective tissue is primarily concerned with providing structural support, connecting and anchoring various tissues and organs in the body, and serving as a medium for transportation of nutrients and waste products. Some types of connective tissue, like adipose tissue, can also store energy. Secretion is a function typically associated with epithelial tissue.
Is a vesicle an organ or a organelle?
A vesicle is an organelle. It is a small, membrane-bound sac that transports and stores substances within a cell. Vesicles are involved in various cellular processes, such as secretion, transport, and storage of molecules.
What are some government programs for mortgage modification?
There are various programs the government offers for mortgage modification. A few programs available from the government to modify your mortgage include Obama's loan modification program and HUD.
Where does secretion occur?
Tubular secretion occurs in the distal convoluted tubes. The secretion also happens in the collecting ducts and also in the proximal convoluted tubule.
What is the purpose of secretion?
The purpose of secretion is to release substances, such as hormones or enzymes, from cells into the external environment or bloodstream for various physiological functions, like digestion, communication, and waste elimination.
What gland releases its secretion into the bloodstream is called?
The gland that releases its secretion into the bloodstream is called an endocrine gland. These glands produce hormones that are released directly into the bloodstream to regulate various body functions.
What happens during the process of secretion?
During the process of secretion, cells release substances such as hormones, enzymes, or waste products into the surrounding environment. This can occur through various mechanisms such as exocytosis or active transport across a membrane. Secretion plays a crucial role in various biological processes such as communication between cells, digestion, and waste removal.
What is abietane?
Abietane is a hydrocarbon which is the structural basis for various chemical compounds.
Where is sandoval fluid in the human body?
Synovial fluid fills the area near a Synovial joint. The fluid is stringy and has egg like consistency. It lubricates the motion of the bones forming the joint. Other types of joints are cartilaginous joints and fibrous joints. Synovial joints themselves are of various types - such as gliding, hinge, pivot, saddle, ball and socket.
