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Biology 2e · Osmotic Regulation and Excretion

Introduction

CC BY 4.0 · OpenStax · approximately 1 min read

Learning objectives

View original figure (external; image not reproduced in this text edition)

Original figure description: Photo shows two garbage trucks dumping their contents into a landfill.

Just as humans recycle what we can and dump the remains into landfills, our bodies use and recycle what they can and excrete the remaining waste products. Our bodies’ complex systems have developed ways to treat waste and maintain a balanced internal environment. (credit: modification of work by Redwin Law)

The daily intake recommendation for human water consumption is eight to ten glasses of water. In order to achieve a healthy balance, the human body should excrete the eight to ten glasses of water every day. This occurs via the processes of urination, defecation, sweating and, to a small extent, respiration. The organs and tissues of the human body are soaked in fluids that are maintained at constant temperature, pH, and solute concentration, all crucial elements of homeostasis. The solutes in body fluids are mainly mineral salts and sugars, and osmotic regulation is the process by which the mineral salts and water are kept in balance. Osmotic homeostasis is maintained despite the influence of external factors like temperature, diet, and weather conditions.

← Blood Flow and Blood Pressure RegulationOsmoregulation and Osmotic Balance →

Attribution. Biology 2e, OpenStax, Rice University, and the contributing authors credited in the book. Licensed under Creative Commons Attribution 4.0 International. Source revision d2779c2edf of openstax/osbooks-biology-bundle (2026-02-03). CC BY 4.0. Original source ↗. Text edition of a pinned CC BY 4.0 source revision of the OpenStax book, converted from CNXML by the EvidenceHelix importer. Original prose, learning objectives, tables, exercises, glossary and captions are preserved; images are not copied (figures link to the original source and keep their credits). No new content was added. Later revisions of this book can carry different licence terms and are not used.

In this chapter Contents

  • Introduction
  • Osmoregulation and Osmotic Balance
  • The Kidneys and Osmoregulatory Organs
  • Excretion Systems
  • Nitrogenous Wastes
  • Hormonal Control of Osmoregulatory Functions

Source

OpenStax source file ↗

Illustrated original ↗

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