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Unformatted text preview: Defence mechanisms of the urinary system Micturition Physiology of Micturition • Micturition Definition: Conversion of continuous involuntary production of urine into intermittent, consciously controlled voiding of urine Bladder function o Collection & low pressure storage of urine Expansion without leaks/reflux to kidneys No significant increase in pressure until full o Appropriate expulsion of urine Bladder anatomy o Hollow, muscular organ; Partially covered by peritoneum o When empty, lies in pelvis & rests on symphysis pubis & floor of pelvis o When filled, enlarges into abdominal cavity Bladder structure o Outer connective tissue layer: Lining is transitional cell epithelium; Inside appears yellow with rugae (folds), except Trigone region o Detrusor muscle: Bands of interlaced (fibres all in 1 direction) smooth muscle with gap junctions, acting as one o Bladder neck/upper urethra: 2-3cm long detrusor muscle + elastic tissue o Trigone region: Mucosa is smooth • Prevent leakage & reflux to kidneys by 3 mechanisms...
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- Fall '10
- Anthropology, micturition