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Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892

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BuyFindarrow_forward

Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892
Textbook Problem

Discuss Concepts A urinalysis reveals glucose, urea, hemoglobin, and sodium. Which of these substances are abnormal in urine, and why?

Summary Introduction

To review:

The abnormal substances present in the urine when urinalysis reveals glucose, urea, hemoglobin, and sodium.

Introduction:

Urine is the nitrogenous excretory product, which is obtained when blood passes through the kidneys under pressure. Normal urine consists of 91–96% (percent) of water along with organic and inorganic compounds. Urinalysis is a clinical test performed to detect the abnormalities present in urine.

Explanation

Presence of glucose and hemoglobin is abnormal in the urine as it indicates a failure of normal filtration mechanism in the nephrons, which takes place along the glomerulus. Presence of urea and sodium is considered normal as they are the by-products of the filtration mechanism taking place in the nephrons. However, glucose is not expected to be found in a urine sample as most of it gets reabsorbed in the plasma during the process of tubular reabsorption...

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