Success! Urinalysis And Body Fluids - All Questions |67 Questions| With Correct Answers.

Which of the following is true about the final concentrating of urine in the kidney? A. The distal convoluted tubule, through active transport, reabsorbs water. B. Water is reabsorbed under the direct influence of angiotensin II. C. Vasopressin controls the collecting duct reabsorption of water. D. Water reabsorption is influenced by urine filtrate levels of potassium. {Ans: C. Vasopressin controls the collecting duct reabsorption of water. The distal convoluted tubule and collecting duct provide water reabsorption through the action of antidiuretic hormone (vasopressin). The renin-angiotensin-aldosterone system is responsible for sodium reabsorption by the distal and collecting tubules. Decreased plasma volume leads to pressure alterations detected by receptors located in the kidney's juxtaglomerular apparatus and the right atrium of the heart. These changes trigger the production of renin and antidiuretic hormone, respectively.}The major formed element in the high power field shown in Color Plate 48 is most likely a A. Granular cast B. Hyaline cast C. Waxy cast D. Fiber artifact {Ans: D. Fiber artifact Refer to Color Plate 48 •. The fringed appearance at the one end of the major formed element strongly suggests that this is a fiber artifact, most likely placed in the sample at the