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Chapter: Medical Physiology: Urine Formation by the Kidneys: I. Glomerular Filtration, Renal Blood Flow, and Their Control

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Micturition

Micturition is the process by which the urinary bladder empties when it becomes filled.

Micturition

Micturition is the process by which the urinary bladder empties when it becomes filled. This involves two main steps: First, the bladder fills progressively until the tension in its walls rises above a threshold level; this elicits the second step, which is a nervous reflex called the micturition reflex that empties the bladder or, if this fails, at least causes a conscious desire to urinate.


Although the micturition reflex is an autonomic spinal cord reflex, it can also be inhibited or facilitated by centers in the cerebral cortex or brain stem.





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