Lecture 37: Kidney Filtration, Secretion, Reabsorption

 

 

Basic Kidney Anatomy

Although the Kidneys are Tiny Organs They Receive 25% of the Cardiac Output

Kidneys Filter About 180 Liters of Plasma Every Day, But Make Only 2 Liters of Urine

The Nephron is the Fundamental Urine-Producing Unit of the Kidney

The Basic Processes of the Kidney are Filtration, Reabsorption and Secretion

 Substance

 % Reabsorbed

 Water

 99.4%

 Na

 99.4%

 K

 93.3%

 HCO3

 100%

 Glucose

 100%

 Urea

 53%

 Inulin

 0%

Data from: William Ganong. Review of Medical Physiology. 1999.

Glomerular Filtration is Easy to Measure From Inulin or Creatinine Clearance

Tubular Reabsorption Has a Maximum Rate

The Kidney is an Osmotic Machine