Notes on Regional Transport

  >   Rahul's Noteblog   >   Notes on Nephrology   >   Notes on Regional Transport

Proximal Tubule:

• 2/3rd of filtered sodium reabsorbed.

• 2/3rd of filtered water, potassium ion, chloride ion reabsorbed.

• All carbohydrates, proteins, peptides, amino acids, and ketones are reabsorbed.

• 80-90% of filtered bicarbonate is reabsorbed.

• All the above processes are powered by the Na-K pump.

Loop of Henle:

• 1/3 of volume going through Bowman's capsule enters the loop of Henle.

Descending limb: permeable to water.

Ascending limb: impermeable to water; Na / Cl / K pumped out.

Collecting duct: ADH tells collecting duct to reabsorb water.

Distal Tubule and Collecting Duct Electrolytes:

• Na/K reabsorption stimulated by aldosterone.

ADH: controls H2O and urea reabsorption.

Aldosterone: controls NaCl and K+ secretion.

• Acidification of urine takes place here.

• Fixed acids and H+ excreted.

• Monohydrogen phosphate freely filtered.

• Ammonia manufactured.

• H+ excreted and bicarbonate reabsorption.

Potassium Dynamics:

• In an acid-base disturbance, there is H+ and K+ exchange between intra- and extracellular spaces.

Acidosis: H+ enters cells; K+ leaves the cells.

Alkalosis: H+ exits the cells; K+ enters the cells.

Additional Reading:

Basic Nephrology

1. Renal Control in Acid-Base Balance
2. Renal Processes
3. Renal Clearance
4. Regional Transport
5. What are the indications for hemodialysis?

Related Topics

1. Kidney Disorders
2. Histology of the Urinary System
3. Acid-Base Disturbance: Acidotic or Alkalotic? [Size: 427 kB; Format: PDF]
4. Abdominal Examination for Internal Medicine

Medical Images

Useful Medical Images & Diagrams (link opens in a new window)

Random Pages:

Life in a Drop of Water Review of eBoundhost VPS hosting
Signs you`re being married to for Green Card Notes on Integument
Notes on Chest Wall Notes on Chlamydia
Notes on Energy Metabolism What are the most common causes of aortic stenosis?
FAQ on Adrenal Hormones Notes on Jaundice
Notes on Basic Gastrointestinal Physiology Corporate Failure: The Enron Case
Review of eBoundhost VPS hosting What is an ELEK`s Test?
Why did I decide to become a doctor? Medical School Admissions Essay Video: Titanic Piano Theme: The Portrait
Corporate Failure: The Enron Case My Experience during the Iraqi Invasion of Kuwait
USMLE Blood Lab Values Regulation of Heart Rate by Autonomic Nervous System
Images of Antibodies Rahul`s Piano Music MP3 Collection
Notes on Male Reproductive System Differentiation and Anatomy of a Blastocyst
Notes on Cell Components Notes on Nervous Tissue
Voices from Hell: My Experience in Mussoorie, India Video of Cardiology Examination in a Clinical Setting

Please Do Not Reproduce This Page

This page is written by Rahul Gladwin. Please do not duplicate the contents of this page in whole or part, in any form, without prior written permission.