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Tonicity in Animals00:59

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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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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...
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The kidneys maintain homeostasis through filtration, reabsorption, and secretion. Tubular reabsorption and secretion are crucial in forming urine and regulating electrolytes, water balance, and waste elimination.Tubular Reabsorption and Secretion ProcessesTubular reabsorption is the process that reclaims essential substances such as electrolytes, glucose, amino acids, and water from the glomerular filtrate back into the bloodstream. This is achieved through passive and active transport...
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Tonicity in Plants01:20

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Plant cells maintain appropriate osmotic balance in extreme conditions. For instance, plants in dry environments store water in vacuoles, limit the opening of their stoma, and have thick, waxy cuticles to prevent unnecessary water loss. Some species of plants that live in salty environments store salt in their roots. As a result, water osmosis occurs in the root from the surrounding soil.
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Tonicity describes the capacity of a cell to lose or gain water. It depends on the quantity of solute that does not penetrate the membrane. Tonicity delimits the magnitude and direction of osmosis and results in three possible scenarios that alter the volume of a cell: hypertonicity, hypotonicity, and isotonicity. Due to differences in structure and physiology, tonicity of plant cells is different from that of animal cells in some scenarios.
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Hypertension is a chronic condition in which the blood's force against artery walls is excessively high, posing risks such as heart disease. The condition's underlying mechanisms involve complex interactions among the cardiovascular, kidney, and autonomic nervous systems.Renin-Angiotensin-Aldosterone System (RAAS): This system significantly influences blood pressure regulation. When blood pressure decreases, the kidneys secrete renin. This enzyme transforms angiotensinogen, a plasma protein,...
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Hypertonicity: Pathophysiologic Concept and Experimental Studies.

Christos Argyropoulos1, Helbert Rondon-Berrios2, Dominic S Raj3

  • 1Department of Medicine, Division of Nephrology, University of New Mexico School of Medicine.

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|July 7, 2016
PubMed
Summary
This summary is machine-generated.

Hypertonicity causes cell shrinking and severe clinical issues. While formulas guide fluid correction, they don't account for fluid losses or new intracellular solutes, impacting treatment effectiveness.

Keywords:
hypertonicityosmolalityosmolarityosmolytesserum sodium concentration

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Area of Science:

  • Nephrology
  • Endocrinology
  • Cell Biology

Background:

  • Disturbances in tonicity, or effective osmolarity, are primary clinical disorders impacting cell volume.
  • Cell shrinking due to hypertonicity can lead to severe clinical manifestations and mortality.
  • Quantitative management of hypertonic disorders relies on formulas to calculate necessary hypotonic fluid volumes for correction.

Purpose of the Study:

  • To evaluate the limitations of current formulas used for managing hypertonic disorders.
  • To investigate the impact of ongoing fluid losses and intracellular solute generation on the accuracy of predictive formulas.
  • To assess the validity of these formulas in specific hypernatremic states.

Main Methods:

  • Review of existing quantitative management formulas for hypertonic disorders.
  • Analysis of closed-system calculations versus real-world fluid dynamics.
  • Examination of studies comparing predicted versus observed serum osmolality changes in hypertonic states.
  • Evaluation of hypertonicity-induced intracellular solute generation and its effects.

Main Results:

  • Existing formulas have limitations as closed-system calculations and were tested in anuric models.
  • Formulas do not account for ongoing fluid losses during hypertonic disorder development or treatment.
  • Hypertonicity generates new intracellular solutes, leading to higher observed serum osmolality than predicted.
  • When hypertonicity is induced by hypertonic sodium chloride infusion, predicted and observed serum sodium changes are equal.

Conclusions:

  • Current predictive formulas for hypertonic disorders have significant limitations due to their failure to account for fluid losses and solute shifts.
  • The generation of intracellular solutes during hypertonicity can adversely affect treatment outcomes.
  • The predictive formulas are validated for managing hypernatremic states when hypertonicity is caused by hypertonic sodium chloride infusion.