Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332



Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332
Textbook Problem

Kidneys return most of the water and small solutes back to blood by way of ___ .

  1. a. glomerular filtration
  2. b. tubular reabsorption
  3. c. tubular secretion
  4. d. both a and b

Summary Introduction

Introduction: Urine formation starts when glomerular filtration delivers protein-free of plasma into a kidney tubule. Most water and solutes are returned to the blood by tubular reabsorption machinery. Substances that are not reabsorbed, and which is added to the filtrate by tubular secretion, end up in the urine. The human urinary system consists of two kidneys, a pair of ureters, a urinary bladder, and the urethra. A nephron begins in the kidney cortex, where the tubule wall of nephron fold back on itself and form a cup- shaped structure called Bowman’s capsule.


Reasons for the correct statement:

Fluid filtered out of the glomerulus drains from Bowman’s capsule into the nephron’s proximal tubule. In the later steps, tubular reabsorption is the process by which the water and solutes returned to the blood.

Option b. is given as “tubular reabsorption”. Hence, option b. is correct.

Reasons for the incorrect statement:

Option a. is given as “glomerular filtration”. However, the process of filtration of fluid and waste products out of the blood into the kidney is called glomerulus filtration...

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