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Related Concept Videos

Disorder of Water Balance01:29

Disorder of Water Balance

Water balance disorders are medical conditions that occur when there is a deviation from the body's water volume or osmolarity, disrupting normal homeostasis and leading todehydration, hypotonic hydration, hyperhydration, edema, or water intoxication.
Dehydration
Dehydration occurs when the body loses fluids (particularly water).
Causes:
The major causes of dehydration include excessive sweating, fever, vomiting, diarrhea, and diuresis.
Signs and Symptoms:
Symptoms primarily include intense...
Regulation of Water Intake01:25

Regulation of Water Intake

Osmolality refers to the number of solute particles per kilogram of solvent in a solution. Plasma osmolality specifically indicates the total number of solute particles per kilogram of water in blood plasma. This value reflects the body's hydration status and is tightly regulated through mechanisms controlling water intake and output. While water consumption is a conscious decision, the body has intrinsic regulatory systems to maintain fluid balance. Dehydration, a state of water deficit...
Tonicity in Animals01:16

Tonicity in Animals

Tonicity describes the amount of solute in a solution. The measure of the tonicity of a solution, or the total amount of solutes dissolved in a specific amount of solution, is called its osmolarity. Three terms—hypotonic, isotonic, and hypertonic—are used to relate the osmolarity of a cell to the osmolarity of the extracellular fluid that contains the cells. In a hypotonic solution, such as tap water, the extracellular fluid has a lower concentration of solutes than the fluid inside the cell,...
Tonicity in Animals00:59

Tonicity in Animals

The tonicity of a solution determines if a cell gains or loses water in that solution. The tonicity depends on the permeability of the cell membrane for different solutes and the concentration of nonpenetrating solutes in the solution within and outside of the cell. If a semipermeable membrane hinders the passage of some solutes but allows water to follow its concentration gradient, water moves from the side with low osmolarity (i.e., less solute) to the side with higher osmolarity (i.e.,...
Primary Motives: Hunger and Thirst01:25

Primary Motives: Hunger and Thirst

Hunger and thirst are fundamental physiological drives crucial for maintaining homeostasis and ensuring the survival of both humans and animals. These drives are regulated through complex interactions between the brain, hormones, and sensory receptors.
Hunger arises when the brain detects changes in the body's nutrient levels, including glucose, lipids, amino acids, and hormones such as ghrelin and leptin. The hypothalamus plays a central role in hunger regulation. The lateral hypothalamus acts...
Heart Failure VI: Adjunct Therapies01:22

Heart Failure VI: Adjunct Therapies

Additional therapies for treating patients with heart failure (HF) may include procedural interventions, supplemental oxygen, the management of sleep disorders, and nutritional therapy.Procedural InterventionsImplantable Cardioverter-Defibrillator: For patients at risk of life-threatening arrhythmias due to severe left ventricular dysfunction, an Implantable Cardioverter-Defibrillator (ICD) can detect and terminate these arrhythmias, preventing sudden cardiac death and improving survival rates.

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Related Experiment Video

Updated: May 31, 2026

Bedside Ultrasound for Guiding Fluid Removal in Patients with Pulmonary Edema: The Reverse-FALLS Protocol
07:59

Bedside Ultrasound for Guiding Fluid Removal in Patients with Pulmonary Edema: The Reverse-FALLS Protocol

Published on: July 28, 2018

Volume depletion versus dehydration: how understanding the difference can guide therapy.

Gautam Bhave1, Eric G Neilson

  • 1Division of Nephrology and Hypertension, Department of Medicine, Vanderbilt University School of Medicine, Nashville, TN 37232, USA.

American Journal of Kidney Diseases : the Official Journal of the National Kidney Foundation
|June 28, 2011
PubMed
Summary

Dehydration, now termed hypertonicity, means losing body water and causing cell shrinkage. Volume depletion involves losing extracellular fluid, leading to blood volume reduction. Understanding this distinction is crucial for accurate medical assessment.

More Related Videos

Evaluation of Fluid Overload by Bioelectrical Impedance Vectorial Analysis
07:17

Evaluation of Fluid Overload by Bioelectrical Impedance Vectorial Analysis

Published on: August 17, 2022

Related Experiment Videos

Last Updated: May 31, 2026

Bedside Ultrasound for Guiding Fluid Removal in Patients with Pulmonary Edema: The Reverse-FALLS Protocol
07:59

Bedside Ultrasound for Guiding Fluid Removal in Patients with Pulmonary Edema: The Reverse-FALLS Protocol

Published on: July 28, 2018

Evaluation of Fluid Overload by Bioelectrical Impedance Vectorial Analysis
07:17

Evaluation of Fluid Overload by Bioelectrical Impedance Vectorial Analysis

Published on: August 17, 2022

Area of Science:

  • Physiology
  • Internal Medicine
  • Biochemistry

Background:

  • Dehydration and volume depletion are frequently confused in clinical practice.
  • Accurate differentiation is essential for appropriate diagnosis and treatment.
  • Hypertonicity is the preferred term for total body water loss.

Observation:

  • Hypertonicity specifically refers to a loss of total body water, leading to increased extracellular fluid osmolality and intracellular volume contraction.
  • Volume depletion refers to a decrease in extracellular fluid volume, impacting plasma volume and potentially leading to hypovolemia.
  • A case of hyperglycemic hypertonic nonketosis illustrates the distinct physiological consequences of these two conditions.

Findings:

  • Hypertonicity results in cellular dehydration due to osmotic shifts.
  • Volume depletion primarily affects the circulatory system, compromising blood volume.
  • The study highlights how fluid shifts differ between hypertonicity and volume depletion using a clinical example.

Implications:

  • Clarifying the terms hypertonicity and volume depletion improves diagnostic accuracy in fluid balance disorders.
  • Distinguishing between these conditions aids in tailoring therapeutic strategies, particularly fluid and electrolyte management.
  • This distinction is vital for understanding and managing complex metabolic and fluid derangements in patients.