FACTOID # 4: Just 1% of the houses in Nevada were built before 1939.
 
 Home   Encyclopedia   Statistics   States A-Z   Flags   Maps   FAQ   About 
   
 
WHAT'S NEW
RELATED ARTICLES
People who viewed "Ureter" also viewed:
 

SEARCH ALL

FACTS & STATISTICS    Advanced view

Search encyclopedia, statistics and forums:

 

 

(* = Graphable)

 

 


Encyclopedia > Ureter
Transverse section of ureter.
Transverse section of ureter.

In human anatomy, the ureters are the ducts that carry urine from the kidneys to the urinary bladder. The ureters are muscular tubes that can propel urine along by the motions of peristalsis. In the adult, the ureters are usually 25 to 35cm long. Image File history File links Transverseureter. ... Image File history File links Transverseureter. ... Anatomical drawing of the human muscles from the Encyclopédie. ... Urine is liquid waste excreted by the kidneys and is produced by the process of filtration. ... Human kidneys viewed from behind with spine removed The kidneys are bean-shaped excretory organs in vertebrates. ... The interior of bladder. ... Peristalsis is the process of involuntary wave-like successive muscular contractions by which food is moved through the digestive tract. ...


In humans, the ureters enter the bladder posteriorly, running within the wall of the bladder for a few centimetres. There are no valves in the ureters, backflow being prevented by pressure from the filling of the bladder, as well as the tone of the muscle in the bladder wall.


Histology

The ureter has a diameter of about 3 millimetres, and the lumen is star-shaped. Like the bladder, it is lined with transitional epithelium, and contains layers of smooth muscle. A millimetre (American spelling: millimeter, symbol mm) is an SI unit of length that is equal to one thousandth of a metre. ... In zootomy, epithelium is a tissue composed of a layer of cells. ... Smooth muscle is a type of non-striated muscle, found within the walls of hollow organs; such as blood vessels, bladders, uteri. ...


The epithelial cells of the ureter are stratified (in many layers), are normally round in shape but become squamous (flat) when stretched. The lamina propria is thick and elastic (as it is important that it is impermeable). The lamina propria is a thin vascular layer of connective tissue beneath the epithelium of an organ. ...


There are two spiral layers of smooth muscle in the ureter wall, an inner loose spiral, and an outer tight spiral. The inner loose spiral is sometimes described as longitudinal, and the outer as circular, (this is the opposite to the situation in the gastrointestinal tract). In mathematics, a spiral is a curve which turns around some central point or axis, getting progressively closer to or farther from it, depending on which way you follow the curve. ... The gastrointestinal or digestive tract, also referred to as the GI tract or the alimentary canal or the gut, is the system of organs within multicellular animals which takes in food, digests it to extract energy and nutrients, and expels the remaining waste. ...


The adventitia of the ureter, like elsewhere is composed of fibrous connective tissue, that binds it to adjacent tissues. In zootomy, fibrous connective tissue (FCT) is a type of connective tissue which has relatively high tensile strength, due to a relatively high concentration of collagenous fibers. ...


Diseases and disorders

Medical problems that can affect the ureter include:


When normal cells are damaged beyond repair, they are eliminated by apoptosis. ... Ultrasonic instrument and kidney stone Kidney stones, also known as nephrolithiases, urolithiases or renal calculi, are solid accretions (crystals) of dissolved minerals in urine found inside the kidneys or ureters. ... A ureterocele is a congenital abnormality found in the urinary bladder. ...

Urinary system

Kidneys - Ureters - Urinary bladder - Urethral sphincters - Urethra The urinary system is the organ system that produces, stores, and carries urine. ... Human kidneys viewed from behind with spine removed The kidneys are bean-shaped excretory organs in vertebrates. ... The interior of bladder. ... In mammals the flow of urine from the urinary bladder is controlled by a group of muscles collectively called the urethral sphincter, named for their proximity to the urethra. ... Female anatomy In anatomy, the urethra is a tube which connects the urinary bladder to the outside of the body. ...


  Results from FactBites:
 
Ureter - Wikipedia, the free encyclopedia (303 words)
In human anatomy, the ureters are the ducts that carry urine from the kidneys to the urinary bladder.
There are no valves in the ureters, backflow being prevented by pressure from the filling of the bladder, as well as the tone of the muscle in the bladder wall.
The inner loose spiral is sometimes described as longitudinal, and the outer as circular, (this is the opposite to the situation in the gastrointestinal tract).
  More results at FactBites »

 
 

COMMENTARY     


Share your thoughts, questions and commentary here
Your name
Your comments

Want to know more?
Search encyclopedia, statistics and forums:

 


Press Releases |  Feeds | Contact
The Wikipedia article included on this page is licensed under the GFDL.
Images may be subject to relevant owners' copyright.
All other elements are (c) copyright NationMaster.com 2003-5. All Rights Reserved.
Usage implies agreement with terms, 1022, m