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The afferent arterioles are a group ofblood vessels that supply the nephrons in manyexcretory

systems. They play an important role in the regulation ofblood pressure as a part of the

tubuloglomerular feedback mechanism

The efferent arterioles are blood vessels that are part of the urinary tract oforganisms. The

efferent arterioles form from a convergence of thecapillaries of theglomerulus.

peritubular capillaries are tiny blood vessels that travel alongside nephrons allowing reabsorption

andsecretion between blood and the inner lumen of the nephron.

In the blood supply of the kidney, the vasa recta renis (or straight arteries of kidney, or straight

arterioles of kidney) form a series of straight capillaries (recta is from theLatin for "straight") in

themedulla. They lie parallel to the loop of Henle

Countercurrent Multiplier System

Conc of filtrate in descending limb reflects conc of the surrounding tissue fluid

Conc of the tissue fluid - raised - active transport - ascending limb

This is a positive feedback system

More salt excreted by the ascending limb - more concentrated will be the fluid delivered to

it by the descending limb

Multiplies the conc of the tissue fluid & the descending limb fluid

http://en.wikipedia.org/wiki/Blood_vesselhttp://en.wikipedia.org/wiki/Nephronhttp://en.wikipedia.org/wiki/Excretionhttp://en.wikipedia.org/wiki/Excretionhttp://en.wikipedia.org/wiki/Excretionhttp://en.wikipedia.org/wiki/Blood_pressurehttp://en.wikipedia.org/wiki/Tubuloglomerular_feedbackhttp://en.wikipedia.org/wiki/Blood_vesselhttp://en.wikipedia.org/wiki/Blood_vesselhttp://en.wikipedia.org/wiki/Urinary_tracthttp://en.wikipedia.org/wiki/Urinary_tracthttp://en.wikipedia.org/wiki/Organismshttp://en.wikipedia.org/wiki/Organismshttp://en.wikipedia.org/wiki/Capillaryhttp://en.wikipedia.org/wiki/Capillaryhttp://en.wikipedia.org/wiki/Glomerulushttp://en.wikipedia.org/wiki/Glomerulushttp://en.wikipedia.org/wiki/Nephronshttp://en.wikipedia.org/wiki/Secretionhttp://en.wikipedia.org/wiki/Secretionhttp://en.wikipedia.org/wiki/Renal_circulationhttp://en.wikipedia.org/wiki/Latin_languagehttp://en.wikipedia.org/wiki/Latin_languagehttp://en.wikipedia.org/wiki/Renal_medullahttp://en.wikipedia.org/wiki/Renal_medullahttp://en.wikipedia.org/wiki/Blood_vesselhttp://en.wikipedia.org/wiki/Nephronhttp://en.wikipedia.org/wiki/Excretionhttp://en.wikipedia.org/wiki/Excretionhttp://en.wikipedia.org/wiki/Blood_pressurehttp://en.wikipedia.org/wiki/Tubuloglomerular_feedbackhttp://en.wikipedia.org/wiki/Blood_vesselhttp://en.wikipedia.org/wiki/Urinary_tracthttp://en.wikipedia.org/wiki/Organismshttp://en.wikipedia.org/wiki/Capillaryhttp://en.wikipedia.org/wiki/Glomerulushttp://en.wikipedia.org/wiki/Nephronshttp://en.wikipedia.org/wiki/Secretionhttp://en.wikipedia.org/wiki/Renal_circulationhttp://en.wikipedia.org/wiki/Latin_languagehttp://en.wikipedia.org/wiki/Renal_medulla

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