Skip to main content
Ch. 26 The Urinary System
Martini - Fundamentals of Anatomy and Physiology 12th Edition
Martini, Nath, Bartholomew12th EditionFundamentals of Anatomy and PhysiologyISBN: 9780137854011Not the one you use?Change textbook
All textbooksMartini, Nath, Bartholomew 12th EditionCh. 26 The Urinary SystemProblem 3
Chapter 25, Problem 3

The process of urine formation involves all of the following, except 
(a) Filtration of plasma
(b) Reabsorption of water
(c) Reabsorption of certain solutes
(d) Secretion of wastes
(e) Secretion of excess lipoprotein and glucose molecules

Verified step by step guidance
1
Step 1: Understand the process of urine formation, which primarily involves three key stages: filtration, reabsorption, and secretion. Filtration occurs in the glomerulus where plasma is filtered to form filtrate.
Step 2: Recognize that reabsorption involves the movement of water and certain solutes from the filtrate back into the bloodstream, helping to conserve essential substances and maintain fluid balance.
Step 3: Identify that secretion is the active transport of additional wastes and excess ions from the blood into the tubular fluid to be excreted in urine.
Step 4: Analyze each option in the problem: (a) filtration of plasma, (b) reabsorption of water, (c) reabsorption of certain solutes, and (d) secretion of wastes are all normal parts of urine formation.
Step 5: Note that (e) secretion of excess lipoprotein and glucose molecules is not a typical part of urine formation because lipoproteins are generally not secreted into urine, and glucose is usually reabsorbed completely unless in pathological conditions like diabetes.

Verified video answer for a similar problem:

This video solution was recommended by our tutors as helpful for the problem above.
Was this helpful?

Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Filtration of Plasma

Filtration is the first step in urine formation where blood plasma is filtered through the glomerulus into Bowman's capsule, allowing water and small solutes to pass while retaining blood cells and large proteins.
Recommended video:
4:30
The Filtration Membane

Reabsorption of Water and Solutes

Reabsorption occurs mainly in the renal tubules, where essential substances like water, glucose, and ions are selectively reabsorbed back into the bloodstream to maintain homeostasis.
Recommended video:
2:30
1b) Passive Reabsorption of Water & Solutes in the Proximal Tubule

Secretion of Wastes

Secretion is the active transport of additional waste substances and excess ions from the blood into the tubular fluid, helping to eliminate toxins and maintain chemical balance in the body.
Recommended video:
01:33
Protein Secretion
Related Practice
Textbook Question

Changing the luminal diameters of the afferent and efferent arterioles to alter the GFR can be an example of 

(a) Hormonal regulation

(b) Autonomic regulation

(c) Autoregulation

(d) All of these

3
views
Textbook Question

Identify the structures of the kidney in the following diagram.

a. ___

b. ___

c. ___

d. ___

e. ___

f. ___

g. ___

h. ___

i. ___

j. ___

k. ___

l. ___

m. ___

Textbook Question

The glomerular filtration rate is regulated by all of the following, except 

(a) Autoregulation

(b) Sympathetic neural control

(c) Cardiac output

(d) Angiotensin II

(e) The hormone ADH

1
views
Textbook Question

The distal convoluted tubule is an important site for 

(a) Active secretion of ions

(b) Active secretion of acids and other materials

(c) Selective reabsorption of sodium ions from the tubular fluid

(d) All of these