Tubular reabsorption and secretion




Tubular reabsorption and secretion

Renal system

Anatomy and physiology

Renal system anatomy and physiology

Fluid compartments and homeostasis


Body fluid compartments

Movement of water between body compartments

Renal clearance, glomerular filtration and renal blood flow

Renal clearance

Glomerular filtration

TF/Px ratio and TF/Pinulin

Measuring renal plasma flow and renal blood flow

Regulation of renal blood flow

Renal tubular reabsorption and secretion

Tubular reabsorption and secretion

Tubular secretion of PAH

Tubular reabsorption of glucose

Urea recycling

Tubular reabsorption and secretion of weak acids and bases

Renal tubular physiology

Proximal convoluted tubule

Loop of Henle

Distal convoluted tubule

Renin-angiotensin-aldosterone system

Renin-angiotensin-aldosterone system

Renal electrolyte regulation

Sodium homeostasis

Potassium homeostasis

Phosphate, calcium and magnesium homeostasis

Renal sodium and water regulation


Sodium homeostasis

Antidiuretic hormone

Kidney countercurrent multiplication

Free water clearance

Renal endocrine functions

Vitamin D


Acid-base physiology

Physiologic pH and buffers

Buffering and Henderson-Hasselbalch equation

The role of the kidney in acid-base balance

Acid-base map and compensatory mechanisms

Respiratory acidosis

Metabolic acidosis

Plasma anion gap

Respiratory alkalosis

Metabolic alkalosis


Tubular reabsorption and secretion


0 / 14 complete

USMLE® Step 1 questions

0 / 1 complete

High Yield Notes

5 pages


Tubular reabsorption and secretion

of complete


USMLE® Step 1 style questions USMLE

of complete

A 65-year-old man is diagnosed with an acute kidney injury. The patient’s fractional excretion of sodium (FENa) is calculated from the patient’s urine and plasma creatinine and sodium levels. Which of the following pairs of FENa and inciting events represents a possible etiology of this patient’s acute kidney injury?  

External Links


Tubular reabsorption and secretion are important processes that occur in the kidneys to maintain the balance of electrolytes and fluids in the body. Tubular reabsorption occurs when the kidneys reabsorb useful substances, such as glucose, amino acids, and electrolytes, from the filtrate back into the bloodstream. This process occurs primarily in the proximal tubule of the nephron and is critical in maintaining the body's electrolyte and fluid balance. Tubular secretion is the opposite process, where the kidneys secrete waste products, such as excess potassium or hydrogen ions, from the bloodstream into the tubular fluid. This process occurs primarily in the distal and collecting tubules of the nephron.


Copyright © 2023 Elsevier, except certain content provided by third parties

Cookies are used by this site.

USMLE® is a joint program of the Federation of State Medical Boards (FSMB) and the National Board of Medical Examiners (NBME). COMLEX-USA® is a registered trademark of The National Board of Osteopathic Medical Examiners, Inc. NCLEX-RN® is a registered trademark of the National Council of State Boards of Nursing, Inc. Test names and other trademarks are the property of the respective trademark holders. None of the trademark holders are endorsed by nor affiliated with Osmosis or this website.