Solvent drag

Solvent drag, also known as bulk transport, refers to solutes in the ultrafiltrate that are transported back from the renal tubule by the flow of water rather than specifically by ion pumps or other membrane transport proteins.[1] This is a phenomenon primarily in renal physiology, but it also occurs in gastrointestinal physiology.

It generally occurs in the paracellular, rather than transcellular, pathway between the tubular cells.

It is seen e.g. in the passive transport in renal sodium reabsorption, renal chloride reabsorption as well as renal urea handling.

References

Walter F., PhD. Boron. Medical Physiology: A Cellular And Molecular Approach. Elsevier/Saunders. ISBN 1-4160-2328-3. Page 791

Physiology of the kidneys and acid–base physiology

Creating urine

Secretion	Clearance Pharmacokinetics Clearance of medications Urine flow rate
Reabsorption	Solvent drag Sodium Chloride Urea Glucose Oligopeptides Protein
Filtration	Renal blood flow Renal plasma flow Ultrafiltration Countercurrent exchange Filtration fraction

Other functions

Hormones	Antidiuretic hormone Aldosterone Atrial natriuretic peptide Renin Erythropoietin Calcitriol Prostaglandins
Fluid balance	Body water: Intracellular fluid/Cytosol Extracellular fluid (Interstitial fluid Plasma Transcellular fluid)
Acid–base balance	Darrow Yannet diagram Base excess Davenport diagram Anion gap (Delta ratio) Winters' formula Buffering Bicarbonate buffer system Respiratory compensation Renal compensation

Assessment and measurement

Other

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