BIOS 256 LAB 5 ASSIGNMENT 6 – QUESTION AND ANSWERS

Part A Reviewing Your Knowledge (pg. 633-634) A. Functions of the Nephron Write name of the part of the nephron that has the following function. 1. Reabsorption of an additional 15% of water by osmosis. Impermeable to solutes. Descending Loop of Henle 2. Hormones determine if urine is concentrated. Collecting Duct 3. Filters blood and forms filtrate. Renal Corpuscle (or Glomerulus) 4. Reabsorption of majority of water and solutes from filtrate by active and passive processes. Also secretion occurs here. Proximal Convoluted Tubule (PCT) 5. Reabsorption of more sodium, chloride, and about 10 to 15% more water. Distal Convoluted Tubule (DCT) 6. Reabsorption of sodium and chloride decreases the osmolarity of filtrate. Nearly impermeable to water. Ascending loop of Henle B. Hormones and Urine Formation Write the term the phrase describes. 1. Hormone that increases sodium and chloride ion reabsorption and potassium secretion. Aldosterone 2. Process of moving substances from renal tubule into the peritubular capillary. Filtration 3. ADH acts mainly at this portion of the nephron. Collecting Duct 4. Process of moving substances from the peritubular capillary into renal tubule. Tubular Secretion 5. Process occurring across wall of glomerular capillary and visceral layer of glomerular capsule. Filtration 6. The act of voiding (emptying) the urinary bladder. Micturition 7. Hormone that increases water reabsorption in the late distal convoluted tubule and collecting duct. ADH C. Urinalysis Answer the following questions with a short answer. 1. What is the normal volume of urine output per day in an adult? 1-2L per 24/hr. (50-60ml per hour) 2. What is the normal color of urine? Yellow or amber 3. What could make urine cloudy? It can turn cloudy after standing; microbes, pus, epithelial cells, or crystals may cause cloudiness. 4. What is the normal specific gravity of urine? 1.001-1.035 5. What makes urine have a higher specific gravity than distilled water? The solutes in the urine give it higher specific gravity than distilled water.