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Osmosis and Osmotic Pressure of Solutions02:40

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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...
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Osmosis is the movement of free water molecules through a semipermeable membrane.  The water's concentration gradient across the membrane is inversely proportional to the solutes' concentration. Whereas diffusion transports material across membranes and within cells, osmosis transports only water across a membrane, and the membrane limits the diffusion of solutes in the water. Osmosis is a special case of diffusion.
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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...
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Osmolarity is the measure of solute concentration in a solution. It plays a critical role in determining water availability for organisms. Water moves across semipermeable membranes through osmosis, flowing from regions of lower solute concentration (more dilute) to regions of higher solute concentration (more concentrated).In high-solute environments, microbial cells lose water, leading to dehydration and inhibited growth. The extent to which water is available to microbes in such environments...
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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.,...
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Boiling Point Elevation
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Updated: Oct 13, 2025

Monitoring the Effect of Osmotic Stress on Secretory Vesicles and Exocytosis
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Monitoring the Effect of Osmotic Stress on Secretory Vesicles and Exocytosis

Published on: February 19, 2018

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Predicting changes in osmolality.

Zhe Yang1, Tongtong Wang1, Yuki Oka1

  • 1Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, United States.

Elife
|November 18, 2021
PubMed
Summary
This summary is machine-generated.

Two neural circuits regulate vasopressin release, anticipating hydration needs before blood water levels change. This discovery advances our understanding of appetite and thirst regulation.

Keywords:
feedforwardfiber photometrymedicinemouseneuroscienceosmolalitypresystemicvasopressinwater balance

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Area of Science:

  • Neuroscience
  • Physiology
  • Endocrinology

Background:

  • Vasopressin (antidiuretic hormone) is crucial for water balance.
  • Its release is traditionally linked to osmotic changes in blood.
  • The precise triggers for vasopressin release during feeding and drinking remain incompletely understood.

Purpose of the Study:

  • To identify the neural circuits controlling vasopressin release.
  • To investigate the timing of vasopressin release relative to physiological changes during eating and drinking.

Main Methods:

  • Utilized advanced neuroimaging techniques in animal models.
  • Monitored neural activity in specific brain regions.
  • Measured vasopressin levels and blood water parameters concurrently.

Main Results:

  • Identified two distinct neural circuits governing vasopressin release.
  • Demonstrated that vasopressin release precedes detectable alterations in blood water concentration.
  • Linked these circuits to the sensory inputs from eating and drinking.

Conclusions:

  • Neural control of vasopressin release is anticipatory, not solely reactive to osmotic shifts.
  • These findings reveal a sophisticated regulatory mechanism for fluid homeostasis.
  • Suggests a paradigm shift in understanding thirst and appetite regulation.