THE EXCRETORY SYSTEM 



I8 S 



after leaving the Malpighian body, twist and turn several 

 times, finally emptying into the ureter (Fig. 95). 



By the arrangement of blood-vessels described above, 

 the arterial blood is brought directly to the glomerulus. 

 It is during its circulation through the glomerulus that the 

 blood gets rid of some of its fluid constituents, while the 



FIG. 96. The kidneys, ureters, bladder, and their vessels viewed from 

 behind: R, Right kidney; U t ureter; A, aorta; Ar, right renal artery; Ve, 

 vena cava inferior; Vr, right renal vein ; Vu, bladder; Ua, commencement 

 of urethra (Campbell). 



waste products are excreted by,the uriniferous tubules. 

 The waste matter, in the form of water, carbon dioxid, 

 salts, and urea, passes into the tubules, and is passed off 

 from the kidney in the form of urine. 



The Blood=supply of the Kidneys. For an organ 

 of its size, the kidney is abundantly supplied with 



