Normal physiology and pathophysiology of the lower urinary tract

Table of Contents

1. Introduction
2. Bladder Filling
3. Voiding
4. Pathophysiology of micturition
5. Impact of bladder symptoms and urinary incontinence
6. Summary
7. References

Voiding

Adults normally void intermittently throughout the day.

Task 1

1

What is an optimum adult bladder capacity? Enter your answer here and then select Check answer. The bladder's capacity is approximately 400-500mls. The bladder can hold a larger volume than this, but it is designed to empty at an optimum capacity. If over-filled the detrusor muscle is unable to maintain a forceful contraction and fatigues easily.

Task 2

2

What would be considered normal limits for frequency of voiding? Select your answer from the options below and then select Check answer. a) 4-5 times per day b) 5-6 times per day c) 6-7 times per day d) 8-9 times per day Yes, adults should normally void between six to seven times per day, depending on fluid intake. Adults should normally void between six to seven times per day, depending on fluid intake. Your answer has been saved.

Bladder emptying (micturition) requires the detrusor muscle to contract at the same time as relaxation of the external urethral sphincter (Fry, 2005). Contraction of the detrusor muscle is maintained until the bladder is emptied fully.