Ureters | To the point | Biology Hubspot - Definition and Examples of Biology Terms

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Wednesday, February 27, 2019

Ureters | To the point

Ureters

Ureters are two tube-like structures that transport urine from the renal pelvis of the kidney to urinary bladder by peristaltic movement of its muscles.
The ureters are thick walled, 25-30 cm in length and having a diameter in the range of 1mm- 10mm.
Ureters do not possess anatomical valve at the site of the opening into the urinary bladder but instead contain physiological valve which operates quite effectively.
When the urinary bladder is filled with urine it generates pressure that causes compression of oblique openings into the ureters by preventing backflow of urine.
If the physiological valve is not properly closed the microbes will travel from urinary bladder towards the kidney resulting infection of either one or both the kidneys.
The wall of ureters is made up of three layers viz. mucosa, muscularis, and adventitia.
The mucosa contains mucus secreted by its goblet cells which prevent cells from coming in contact with the urine.
The middle muscularis consists of inner longitudinal and outer circular layers of the smooth muscle fibers. The main function of muscularis is peristalsis.
The superficial layer adventitia consists of areolar connective tissue and different blood and lymphatic vessels. Its function is to anchor the ureters.

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