RENAL CIRCULATION ::
Kidney has a rich arterial supply through respective renal arteries and the blood returns through respective renal veins The renal artery breaks up into anterior division and posterior division Each division of artery further ramifies and passes between the pyramids as interlobar arteries
The intralobar arteries give arcuate arteries These arteries run across the bases of the pyramids and give off branches called interlobular arteries These arteries give off afferent vessels of glomerulus just before entering the glomerulus the afferent vessels contain number of juxta glomerular cells These cells secrete renin which controls the renal blood flow and through angiotensin (renin- angiotensin system ) regulate blood pressure
The vessel coming out from glomerulus is efferent arteriole The efferent arteriole breaks up into a capillary network around the tubules This is called peritubular network This peritubular network forms venous plexuses which forms interlobular veins and finally they form interlobar veins The interlobar veins open into the renal vein
Renal circulation has following characteristics ::
1.Renal -portal system :: Blood has to circulate through the tuft of glomeruli and also through peritubular capillaries The glomeruli filters and peritubular capillaries reabsorb
2.Through the glomeruli filter all the circulating blood must pass
3.Pressure in renal vessels run higher than in systemic peritubular capillaries
4.The rate and volume of blood flow is also high
The nerve supply to the kidneys is from the autonomic nervous system
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