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Related Concept Videos

Composition of Blood Plasma01:24

Composition of Blood Plasma

Blood plasma is a fluid that contains approximately 92% water and 8% solutes. The solutes include various types of proteins, which constitute about 7% of the total solutes in the plasma. The high-molecular-weight proteins—albumins, globulins, and fibrinogen—are essential to plasma function. Albumins, making up about 60% of the plasma proteins, maintain the osmotic balance within blood vessels by preventing excessive water leakage. Additionally, albumins serve as carrier proteins, binding to...
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The filtration membrane in the renal system is a highly specialized structure essential for filtering blood. It consists of glomerular capillaries and podocytes, forming a selective barrier that permits the passage of water and small solutes while restricting most plasma proteins and blood cells.
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The function of the kidneys is to filter, reabsorb, secrete, and excrete. Every day the kidneys filter nearly 180 liters of blood, initially removing water and solutes but ultimately returning nearly all filtrates into circulation with the help of osmoregulatory hormones. This process removes wastes and toxins but is also crucial to maintain water and electrolyte levels. Most of these functions are performed by the tiny but numerous nephrons contained within the kidneys.
Composition of Body Fluids01:29

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Physiology of Urine Formation01:24

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Urine formation is an essential function of the human body. It plays a critical role in maintaining homeostasis by regulating the volume and composition of body fluids. The kidneys, the primary organs involved in this process, filter blood to remove waste products and excess substances, ultimately producing urine.
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Protein Digestion, Ultrafiltration, and Size Exclusion Chromatography to Optimize the Isolation of Exosomes from Human Blood Plasma and Serum
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THE CHARACTERISTICS OF ULTRAFILTRATES OF PLASMA.

R C Ingraham1, C Lombard, M B Visscher

  • 1Department of Physiology, University of Illinois, Chicago.

The Journal of General Physiology
|October 30, 2009
PubMed
Summary
This summary is machine-generated.

Ultrafiltration establishes membrane equilibria, altering ion concentrations in ultrafiltrate compared to plasma. Changes in protein-bound base influence ion distribution, explained by Donnan equilibrium and protein effects on ion activity.

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Area of Science:

  • Physiological chemistry
  • Membrane transport

Background:

  • Ultrafiltration is a key process in body fluid formation.
  • Understanding ion distribution during ultrafiltration is crucial for physiological studies.

Purpose of the Study:

  • To investigate membrane equilibria during ultrafiltration.
  • To determine the factors influencing ion concentration differences between plasma and ultrafiltrate.

Main Methods:

  • Calculations based on Fick diffusion law and Donnan equation.
  • Analysis of ion concentrations (chloride, sodium) in plasma and ultrafiltrate.
  • Experimental manipulation of protein-bound base by altering bicarbonate content.

Main Results:

  • Ultrafiltration leads to the establishment of membrane equilibria.
  • Chloride ions are more concentrated, and sodium ions less concentrated in ultrafiltrate than in plasma.
  • Reduced bicarbonate increases the difference in ion concentrations, supporting the Donnan effect.

Conclusions:

  • Membrane equilibrium effects, driven by the Donnan equation, are responsible for observed ion distribution changes.
  • Protein's influence on cation activity coefficients contributes to differences between cation and anion distribution ratios.
  • These findings are critical for understanding the role of ultrafiltration in producing body fluids.