Urinary System Anatomy - Practice on models 1. Name the specialized capillary that is the start of the filtration process. 2. Name the first section of the nephron tubule. 3. Name the u-shaped loop section of the nephron. 4. Name the nephron segment that is after the nephron loop and before the collecting duct 3 The region of the nephron where most water is reabsorbed back to the blood. 5. The apex of the renal pyramid that empties urine into minor calyx. 6. 6. 7. This structure surrounds the apex the renal pyramid. of 7.