الفهرس 
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Abstract
A study of biological systems is a complex process owing to mutual interaction between the systems and the
large r.~~0~ ef variables sociated’with any prevailing ope~ation~ Also, the complexity arises from the so many cpposing theories put to explain a certain operation. The human kidney is a typical example for such co~plexity due to the so many functions associated with it. The present research is devoted to elucidate some of the transport processes in the kidney. Among the most important aspects is the role played by the glomerulus in kidney function and the part played by Henle’s loop in urine concentration. The problem is tackled through medeling technique for the nephron and vasa recta. The problem deemed necessary the deduction of a corrected eauation- for blood viscosity. Ageneral model was presented for the kidney, but owing to lack o~ data concerning uhe transport parameters of the nephron, specific models were presented and the soluto ion was made possible by assuming data as near as pOBsible to real situations. A new concept for the role of hemod~mamics was also presented.