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23.What forces help propel urine from the renal pelvis to the urinary bladder? peristaltic24.What is micturition? How does the micturition reflex occur? Excretion of excess water,25.How do the location, length, and histology of the urethra compare in males and females? The26.What roles do the liver and lungs play in the elimination of wastes? The liver has many27.Which type of embryonic tissue develops into nephrons? Mesoderm.28.Which tissue gives rise to collecting ducts, calyces, renal pelves, and ureters? Besides the kidneys29.To what extent do kidney mass and filtration rate decrease with age? With aging, the kidneys