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Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332

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BuyFindarrow_forward

Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332
Textbook Problem
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Secretion of H+ into kidney tubules ___ .

  1. a. makes extracellular fluid less acidic
  2. b. makes urine less acidic
  3. c. can cause acidosis
  4. d. is regulated by aldosterone

Summary Introduction

Introduction: Urine formation starts when glomerular filtration delivers protein-free of plasma into a kidney tubule. Most of the water and solutes return to the blood by the tubular reabsorption machinery. Substances that are not reabsorbed, and which are added to the filtrate by the tubular secretion, end up in the urine. The kidney contributes to the acid-base balance by adjusting the tubular reabsorption of bicarbonate and tubular secretion of H+.

A decline in pH causes an increase in the bicarbonate reabsorption. The bicarbonate moves into peritubular capillaries, where it buffers the excess acid.

Explanation

Reasons for the correct statement:

Increase in hydrogen ion concentration (H+) increases the acidity of the fluid. Secretion of H+ ions into kidney tubules makes extracellular fluid less acidic and urine more acidic.

Option a. is given as “makes extracellular fluid less acidic”. Hence, option a. is correct.

Reasons for the incorrect statement:

Option b. is given as “makes urine less acidic”. But, Secretion of H+ ions into kidney tubules make urine more acidic.

So, option b...

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