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Tonicity in Animals

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.,...

Tonicity in Animals

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,...

Osmosis and Osmotic Pressure of Solutions

Osmosis and Osmotic Pressure of Solutions

A number of natural and synthetic materials exhibit selective permeation, meaning that only molecules or ions of a certain size, shape, polarity, charge, and so forth, are capable of passing through (permeating) the material. Biological cell membranes provide elegant examples of selective permeation in nature, while dialysis tubing used to remove metabolic wastes from blood is a more simplistic technological example. Regardless of how they may be fabricated, these materials are generally...

Pharmaceutical Alternatives: Stability-Related Therapeutic Nonequivalence

Pharmaceutical Alternatives: Stability-Related Therapeutic Nonequivalence

Generic intravenous (IV) drugs are considered bioequivalent to their branded counterparts due to their 100% bioavailability upon administration. However, variations in stability among different drug products can significantly influence their therapeutic performance, even if they are pharmaceutically equivalent.Cefuroxime, a prophylactic antimicrobial, is often used as a single-dose IV injection for patients undergoing coronary artery bypass grafting surgery. A 3 g dose typically provides...

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Related Experiment Video

Updated: Jun 4, 2026

Intranasal Administration of CNS Therapeutics to Awake Mice

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Published on: April 8, 2013

[Hypertonic (3%) vs. isotonic brine nosespray--a controlled study].

O Michel¹, A K Dressler

¹Vrije Universiteit Brussel, Universitair Ziekenhuis Dienst KNO, Brüssel, Belgium. omichel@uzbrussel.be

Laryngo- Rhino- Otologie

|February 11, 2011

Summary

This summary is machine-generated.

Hypertonic saline nasal spray improved nasal airflow objectively and subjectively in healthy volunteers. While it did not significantly alter mucociliary clearance, it offers a potential alternative to decongestant sprays.

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Published on: May 20, 2016

Area of Science:

Nasal physiology
Respiratory medicine
Pharmacology

Background:

In vitro studies suggest hypertonic salt solutions enhance mucociliary beat frequency.
Isotonic saline nasal sprays are widely marketed for wellness and nasal conditions.
A gap exists in understanding hypertonic saline's in vivo effects on nasal airflow and clearance.

Purpose of the Study:

To evaluate the effect of a 7-day application of hypertonic sodium chloride (3% NaCl) nasal spray on nasal airflow and mucociliary clearance in healthy volunteers.
To compare the efficacy of hypertonic saline spray against isotonic saline spray (0.9% NaCl).
To assess subjective user experience and objective physiological measurements.

Main Methods:

A randomized, double-blind, controlled trial involving 20 healthy volunteers.
Application of hypertonic (3% NaCl) and isotonic (0.9% NaCl) saline nasal sprays for 7 days.
Measurements included saccharine clearance test (SCT), rhinomanometry, and subjective questionnaires.

Main Results:

No significant changes in saccharine clearance test (SCT) results were observed in either group.
Rhinomanometry revealed a significant increase in nasal airflow after 7 days of hypertonic spray application.
Volunteers reported the hypertonic solution as subjectively more effective for nasal airflow.

Conclusions:

Hypertonic saline nasal spray demonstrated a significant objective and subjective influence on nasal airflow, despite not impacting mucociliary clearance in this 7-day study.
The findings suggest hypertonic saline may be a viable option for improving nasal airflow and potentially reducing reliance on decongestant nasal sprays.
Further research is warranted to explore the long-term effects and specific applications of hypertonic saline in various nasal conditions.