Forces in the Urinary System Water and Excrete and Secrete Uriniferous WasteKey Words kidney renal arteriole Bowman’s capsule filter tubule proximal convoluted tubule distal convoluted tubule collecting tubule ureter countercurrent mechanisms urine production gradients membrane filter bladder urethra drawing 16100b.800Ashley Davidoff MD TheCommonVein.net Peristalsis in Ureter and Bladder – Contraction to Move Urinary Waste Out Key Words kidney ureters bladder post void calyces pelvis post void forces physiology contraction IVP physiology Plain X-ray KUB31843Ashley Davidoff MD TheCommonVein.net