Countercurrent exchanger mechanism

 

The counter-current exchanger mechanism which takes place in the vasa recta is simple enough and its main aim is to keep the hypertonic nature of the loop of Henle's environment. It works in the pyramids which already have become hypertonic. The ascending vasa recta absorbs the solutes using concentration gradient. The solutes are passed into the descending vasa recta and from there back into the pyramidal environment. Hence this counter-current system maintains the hypertonic nature of the environment of the pyramids thereby encouraging osmotic gradient to allow water to flow from the collecting ducts to the same environment. In effect it concentrates urine which otherwise would have been dilute and loose water.

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Cell Biology
Histology
Embryology
Gross anatomy
Lymphatic drainage
Organ integration
Clinical anatomy

Quiz

Dissector

Physiology

Biochemistry

Chemical Pathology

Anatomical Pathology

Pharmacology

Imaging

Medicine

Surgery
 

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