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Urinary Homeostasis and Formation

Urinary Homeostasis and Formation

Author: Nathan Lampson

This lesson will identify the role of the kidneys in maintaining homeostasis in extracellular fluids.

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Urinary System: Maintaining Homeostasis as Body Fluids Change

Source: Image from Adobe Illustrator; Public Domain

Terms to Know
Bowman's Capsule

A section of a nephron where afferent arterioles deliver blood to the nephron for water and solutes to be filtered out.

Extracellular Fluid

Fluid of the body that is contained outside of cells. Plasma is an example of extracellular fluid outside of blood cells.


The first step in urine formation in which urine is filtered from afferent arterioles in the Bowman's capsule of a nephron.


A tangle of blood vessels in the Bowman's capsule where water and solutes are forced out of blood and into the Bowman's capsule to begin the next stage of urine formation.


Organs of the body that produce urine and help to regulate the composition and volume of body fluids.

Peritubular Capillaries

Capillaries associated with nephrons which allow water and solutes to be exchanged between the nephron and the blood during urine formation.


The second step in urine formation, in which valuable water and solutes are reabsorbed back into the blood.


The third step in urine formation in which filtrate moves toward collecting ducts; secretion helps maintain the body's acid-base balance.


A reflex that occurs when the urinary bladder fills to capacity and is stimulated to empty itself.


A substance formed by the kidneys and excreted from the body as a means to regulate the composition and volume of extracellular fluids.