Renal Blood Flow
__OBSAH__ The kidneys are the main component of the excretory system. The arrangement of the vessels is crucial for its proper function.
Vascular Arrangement in the Kidneys
Per minute, approximately 1.2 - 1.3 litres of blood will flow into the kidneys (aka 25% of the resting cardiac output of the renal artery (a. renalis), which branching to become the segmental arteries (aa. segmentalis). These further branch go interlobar arteries (aa. interlobares), and further into the arcuate arteries (aa. arcuatae). 90% of blood flows to the cortex, leaving the rest to flow in the renal medulla. Vas afferent opens into a capillary bed in the renal glomerulus, where an ultrafiltrate of blood plasma is formed. Filtration is due to the action of the Starling Forces on the vessel wall (see glomerular filtration). The renal circulation si characterized by a system of two capillary networks - glomerular and peritubular. The glomerular is high pressure (60mm Hg), which is due to the relative proximity of the aorta. The peritubular network is low pressure (8mm Hg) and follows the glomerular network. Along the Loop of Henle, there is the vasa recta that functions to drain the resorbed substances back into the circulation. The veins in the rest of the circulation are called the same as the arteries.
Regulatory Mechanisms of the Renal Circulation
__ Regulační mechanismy renální cirkulace
Odkazy
Externí odkazy
Reference
Zdroje
- KITTNAR, Otomar. Lékařská fyziologie. 1. vyd. Praha: Grada, 2011. ISBN 978-80-247-3068-4.
- TROJAN, Stanislav. Lékařská fyziologie. 4. vyd. přepr. a dopl. Praha: Grada Publishing, 2003, 771 s. ISBN 80-247-0512-5.
- Vylučovací soustava FBLT
Kategorie:Anatomie Kategorie:Fyziologie
