Urinary bladder is lined with?

GMCH Chandigarh - 2019

Applied Anatomy

Easy

Appeared in: GMCH Chandigarh - 2019

Explanation

The urinary bladder is lined by a specialized tissue called transitional epithelium, also known as urothelium.
This tissue is unique to the urinary system and is found in the ureters, bladder, and proximal urethra.
Its primary function is distensibility, meaning it can stretch to accommodate large volumes of urine.
When the bladder is empty, the cells are cuboidal or dome-shaped; when the bladder is full, the cells flatten and become squamous-like.

Option A: Simple epithelium consists of a single layer of cells and is adapted for absorption, secretion, and filtration. It is too thin and fragile to withstand the stretching and volume changes that occur in the urinary bladder.
Option B: While transitional epithelium is technically a type of stratified epithelium, 'Transitional epithelium' is a more specific and therefore the best answer. The general term 'stratified epithelium' most often refers to stratified squamous epithelium, which is designed for protection against abrasion, not stretching.
Option D: Pseudostratified epithelium appears to be multi-layered but is actually a single layer of cells of varying heights. It is typically ciliated and involved in moving mucus.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Identification of the specific epithelial tissue lining the urinary bladder as background academic context rather than a clinical decision trigger.
Understanding the urothelium is crucial for recognizing the origin of most bladder cancers (urothelial carcinoma), which arise from these cells.
The barrier function of the urothelium prevents toxic substances in urine from leaking into the underlying tissues. Damage to this barrier can lead to inflammation and other bladder conditions.
During urinary catheterization, nurses must use aseptic technique to avoid introducing pathogens that could cause a urinary tract infection (UTI), which inflames this epithelial lining.

How to Approach the Question

This is a factual recall question from anatomy and physiology.
First, identify the key terms in the question: 'Urinary bladder' and 'lined with'.
Recall the different types of epithelial tissues and their primary functions and locations.
Associate the urinary bladder with its unique function of stretching to hold urine.
Match this function to the specific epithelium designed for distensibility, which is transitional epithelium.
Eliminate other options by recalling their main locations: simple epithelium for absorption/secretion, stratified squamous for protection, and pseudostratified for the respiratory tract.

Concept Tested & Keywords

Concept Tested: Identification of the specific epithelial tissue lining the urinary bladder.
Stem keywords: Urinary bladder, lined with, epithelium
Lead-in keywords: BEST, MOST RELEVANT CLUE

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