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Composition of Body Fluids

Composition of Body Fluids

Water functions as a solvent accommodating various solutes, which can be categorized under electrolytes and non-electrolytes. Non-electrolytes are usually held together by covalent bonds, restricting them from dissociating in solution, thereby leading to a lack of electrically charged components upon dissolving in water. They are predominantly organic molecules, such as glucose, creatinine, and urea. Electrolytes, on the other hand, are compounds that can break down into ions in water.

Introduction to Electrolytes

Introduction to Electrolytes

In humans, electrolytes play a vital role in various physiological processes. Balancing electrolyte levels is essential for normal body functions; their imbalance can be life-threatening. The major electrolytes include sodium, potassium, chloride, calcium, phosphate, and bicarbonate. They are primarily involved in physiological processes, such as nerve signal transmission, membrane trafficking, muscle contraction, buffering body fluids, and balancing water levels in the body.
Role of Sodium
One...

Ionic Bonds

Ionic Bonds

When atoms gain or lose electrons to achieve a more stable electron configuration they form ions. Ionic bonds are electrostatic attractions between ions with opposite charges. Ionic compounds are rigid and brittle when solid and may dissociate into their constituent ions in water. Covalent compounds, by contrast, remain intact unless a chemical reaction breaks them.Opposing Charges Hold Ions Together in Ionic CompoundsIonic bonds are reversible electrostatic interactions between ions with...

Ionic Bonds

Ionic Bonds

When atoms gain or lose electrons to achieve a more stable electron configuration they form ions. Ionic bonds are electrostatic attractions between ions with opposite charges. Ionic compounds are rigid and brittle when solid and may dissociate into their constituent ions in water. Covalent compounds, by contrast, remain intact unless a chemical reaction breaks them.Opposing Charges Hold Ions Together in Ionic CompoundsIonic bonds are reversible electrostatic interactions between ions with...

Roles of Electrolytes: Sodium and Potassium

Roles of Electrolytes: Sodium and Potassium

Sodium plays a crucial role in maintaining fluid and electrolyte balance and overall bodily homeostasis. Sodium balance is primarily regulated by kidney function, which adjusts sodium elimination to match dietary intake and maintain proper electrolyte levels. Sodium is the most abundant cation in the extracellular fluid (ECF) and is found in salts such as sodium chloride (NaCl) and sodium bicarbonate (NaHCO3). Although cellular plasma membranes are relatively impermeable to sodium, its role in...

Roles of Electrolytes: Chloride and Bicarbonate

Roles of Electrolytes: Chloride and Bicarbonate

Chloride ions contribute to the osmotic pressure gradient distinguishing the intracellular fluid (ICF) from the extracellular fluid (ECF). They counterbalance positively charged ions in the ECF and ensure its electrochemical stability. The renal system's process of chloride absorption and release generally mirrors that of sodium ions.
Conditions such as hypochloremia can arise from insufficient chloride reabsorption by the kidneys, often compounded by extended bouts of diarrhea, vomiting, or...

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Related Experiment Video

Updated: Jun 11, 2026

Measurement of Ion Concentration in the Unstirred Boundary Layer with Open Patch-Clamp Pipette: Implications in Control of Ion Channels by Fluid Flow

Measurement of Ion Concentration in the Unstirred Boundary Layer with Open Patch-Clamp Pipette: Implications in Control of Ion Channels by Fluid Flow

Published on: January 7, 2019

Fluids, pH, ions and electrolytes.

Lewis J Kaplan¹, John A Kellum

¹Yale University School of Medicine, Department of Surgery, Section of Trauma, Surgical Critical Care and Surgical Emergencies, New Haven, Connecticut, USA.

Current Opinion in Critical Care

|July 9, 2010

Summary

Understanding fluid properties in critical care is key. This review highlights how crystalloid and colloid fluids impact acid-base balance, aiding clinicians in optimizing patient management.

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Last Updated: Jun 11, 2026

Measurement of Ion Concentration in the Unstirred Boundary Layer with Open Patch-Clamp Pipette: Implications in Control of Ion Channels by Fluid Flow

Measurement of Ion Concentration in the Unstirred Boundary Layer with Open Patch-Clamp Pipette: Implications in Control of Ion Channels by Fluid Flow

Published on: January 7, 2019

Generation and Control of Electrohydrodynamic Flows in Aqueous Electrolyte Solutions

Generation and Control of Electrohydrodynamic Flows in Aqueous Electrolyte Solutions

Published on: September 7, 2018

Evaluation of Fluid Overload by Bioelectrical Impedance Vectorial Analysis

Evaluation of Fluid Overload by Bioelectrical Impedance Vectorial Analysis

Published on: August 17, 2022

Area of Science:

Critical care medicine
Physicochemical principles
Acid-base balance

Background:

Maintenance and resuscitation fluid use are critical in intensive care.
Crystalloid and colloid fluids have well-documented benefits and side effects.
Fluids are often underutilized as pharmacologic agents.

Purpose of the Study:

To review properties, benefits, and side effects of crystalloid and colloid fluids.
To emphasize a physicochemical approach to fluid management.
To enhance understanding of fluid impact on acid-base disorders.

Main Methods:

Focused review of scientific literature.
Analysis of fluid properties and their physiological effects.
Application of physicochemical principles to acid-base disorders.

Main Results:

Fluid properties directly influence acid-base balance.
A physicochemical approach allows precise quantification of ionic species affecting pH.
Understanding these principles aids in anticipating and managing fluid-related complications.

Conclusions:

Clinicians can optimize fluid and acid-base management through a deeper understanding of fluid properties.
This review provides insights for improved bedside clinical care.
A deliberate, pharmacologic approach to fluid administration is recommended.