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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

One role of tubules in excretion is to:

a. absorb H+ ions to buffer body fluids.

b. transport proteins across the transport epithelium.

c. reabsorb glucose and amino acids.

d. move toxic substances from the filtrate into the cells composing the transport tubules.

e. filter by maintaining a lower pressure in the fluid outside thetubule than inside it.

Summary Introduction

Introduction:

The secretion in which the blood is filtered from urine that contains liquid waste from peri-tubular capillaries to renal tubular lumen, is known as tubular secretion. In this process, filtration and secretion play a major role in eliminating waste substances from the blood. Filtration is a nonselective process whereas tubular secretion is a selective process.

Explanation

Justification/explanation for the correct answer:

Option (c) states that reabsorption of glucose and amino acids is one of the roles of tubules in excretion. The tubules are responsible for the reabsorption of small molecules, such as ions, glucose, and amino acid through various transporters located on the membrane. Due to this, water moves from tubule into the interstitial fluid. This process is called selective reabsorption or tubular reabsorption. Hence, option (c) is correct.

The explanation for the incorrect answer:

Option (a) states that absorption of hydrogen ions to buffer body fluids is one of the roles of tubules in excretion. The maintenance of the body fluid is done through a process called acid-base homeostasis. The main function of tubules is to reabsorb the essential molecules and maintain the osmolarity through transporters present in the membrane...

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