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Related Concept Videos

Urinary Bladder01:23

Urinary Bladder

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The urinary bladder is a hollow, muscular sac that temporarily stores urine before it is expelled from the body. It can hold approximately 600 mL of urine prior to micturition. The bladder is retroperitoneal and located behind the pubic symphysis in the pelvic floor.
In males, the bladder is situated in front of the rectum, while in females, it is positioned anterior to the vagina and uterus. The bladder floor contains an inverted triangular area called the trigone, defined by the two ureteric...
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Urinary Tract Infection II: Pathophysiology01:25

Urinary Tract Infection II: Pathophysiology

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The pathophysiology of urinary tract infections (UTIs) encompasses several progressive stages, beginning with bacterial colonization and culminating in potential systemic complications if untreated. UTIs are primarily initiated by bacteria, such as Escherichia coli, which often originate from the gastrointestinal tract and migrate to the urinary system through the periurethral area. This migration can occur via several routes, including improper hygiene practices, sexual activity, or...
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Anatomy of the Genitourinary System II: Bladder and Urethra01:19

Anatomy of the Genitourinary System II: Bladder and Urethra

233
The lower urinary system consists of the urinary bladder and urethra, which are essential in storing and expelling urine from the body. Together with the internal and external sphincters, these structures work together to regulate urination effectively.Anatomy of the BladderThe urinary bladder is a muscular, stretchable organ behind the pubic bone and in front of the rectum. In females, the bladder is positioned anterior to the vagina and inferior to the uterus, while in males, it is located...
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Defense Mechanism Against Infection01:26

Defense Mechanism Against Infection

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Natural flora, body system defenses, and inflammation are natural barriers of the body against infectious agents regardless of previous exposure. Normal floras of the human body refer to the microbial population that colonizes the skin and mucous membranes.
In addition, many body organ systems have unique defenses against infection. The skin is an intact, multilayered surface preventing invasion by microorganisms unless impaired. Mucous membranes lining the mouth, nose, and eyelids are barriers...
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Cell-mediated Immune Responses01:40

Cell-mediated Immune Responses

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Overview
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Urinary Tract Infection III: Diagnostic Studies and Interprofessional Care01:30

Urinary Tract Infection III: Diagnostic Studies and Interprofessional Care

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A healthcare provider can diagnose a urinary tract infection (UTI) through several methods:Medical History and Symptoms: The provider will take a detailed medical history and ask about symptoms such as frequent urination, burning sensation during urination, and lower abdominal pain.Urinalysis: A clean-catch urine sample is collected in a sterile container and tested for the presence of bacteria, white blood cells (leukocytes), nitrites, blood, and protein. The presence of leukocytes and...
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Related Experiment Video

Updated: Sep 25, 2025

Induction of Invasive Transitional Cell Bladder Carcinoma in Immune Intact Human MUC1 Transgenic Mice: A Model for Immunotherapy Development
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Tissue Immunity in the Bladder.

Georgina S Bowyer1,2,3, Kevin W Loudon1,2,3, Ondrej Suchanek1,2,3

  • 1Molecular Immunity Unit, Department of Medicine, University of Cambridge, Cambridge, United Kingdom;

Annual Review of Immunology
|April 26, 2022
PubMed
Summary
This summary is machine-generated.

The bladder

Keywords:
bladdermacrophagesmucosal immunitytissue immunityurinary tract infectionurothelial cells

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Area of Science:

  • Urology
  • Immunology
  • Microbiology

Background:

  • The bladder, part of the urinary tract, expels waste and is exposed to pathogens.
  • It harbors a commensal microbiome, requiring immune tolerance and pathogen resistance.
  • Bacterial bladder infections (cystitis) are common, especially in women, yet human bladder immunity is poorly understood.

Purpose of the Study:

  • To review current knowledge of bladder tissue immunity.
  • To focus on the defense mechanisms against bacterial infection.
  • To identify gaps in understanding and future research priorities.

Main Methods:

  • Literature review and synthesis of existing research on bladder immunity.
  • Discussion of the urothelium's immune functions.
  • Analysis of resident immune cells: macrophages, dendritic cells, natural killer cells, and gamma-delta T cells.

Main Results:

  • The bladder urothelium possesses significant immune functionality.
  • Resident immune cells play a crucial role in bladder defense.
  • Adaptive immune responses are frequently insufficient for preventing recurrent bladder infections.

Conclusions:

  • Bladder immunity involves a complex interplay between the urothelium and resident immune cells.
  • Understanding these mechanisms is key to addressing recurrent bladder infections.
  • Further research is needed to elucidate adaptive immune responses and improve infection prevention.