Right 

 kidney 



Pelvis 



Ureter 



^ — Aorta 



Bladder 



Urethra 



L_ 



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KIDNEYS AND BLADDER 



Blood is carried to each kidney by a branch from the descending aorta. The small- 

 est arteries form a network of capillaries within the cortex and the medulla of the 

 kidney. Veins carry blood from the capillaries to the descending vena cava. Urine 

 secreted from the capillaries of the cortex passes through collecting tubules that open 

 into the pelvis. By peristaltic motion urine is forced through the ureter into the bladder, 

 in which it is temporarily stored, being expelled at intervals through the urethra 



