Urinary Flow and Ureteral Peristalsis

摘要: The only known function of the renal pelvis and ureter is to convey urine from kidney urinary bladder. This transport achieved in two ways: 1. By peristaltic activity. A portion pushed ahead a contractile wave, which almost completely obliterates tubular lumen. 2. pressure gradient an open system. These modes are shown Fig. During first type pelvic pressures low (< 10 mmHg); ureteral during diastole even lower, but show considerable local increase contraction. second transport, through wide-open ureter, may be present large flow; head not caused by contraction smooth muscles upper tract generated flow urine, therefore reflects arterial blood pressure. When test subject assumes upright position, along increased some extent gravity. Open image new window Fig. 1. Peristaltic (left) system (right). Lower part diagram illustrates activity non-obstructing catheter obstructing producing retention