• The urinary bladder fills with urine by a series of peristaltic contractions at a rate of 0.5-5 ml/min. This is accomplished without a significant increase in intra-vesical pressure and without any involuntary bladder contractions. In other words, the normal bladder is highly compliant over the usual volume range. Compliance is a function of the components of the bladder wall, including elastic tissue and smooth muscle. Intra-vesical pressure depends on the hydrostatic pressure at the bladder neck, bladder wall tension and on the transmission of intra-abdominal pressure.

• The urethra remains closed during the filling and storage phases, and the intra-urethral pressure always exceeds the intra-vesical pressure. Closure is maintained by a number of factors, including:

Passive and active effects of striated and smooth muscle components. Elasticity of the urethra.

Transmission of intra-abdominal pressure to the proximal urethra by a flutter-

valve effect. Surface tension of the urethra. Submucosal vascularity of the urethra.

• The normal bladder stores 350-500 ml.

Was this article helpful?

0 0
Wake Up Now

Wake Up Now

For Those Who Can’t Wake Up On Time And Fatigue Throughout The Day. Now You Can Wake Up Early And Be Super Energetic Everyday.

Get My Free Ebook

Post a comment