Renal processes which combined generate urine

Question

Name the three main renal processes which combined generate urine?

Answer 1

Urine is made up by the occurrence of three processes in the nephron: glomerular filtration, tubular resorption and the tubular secretion.

In nephron, the blood carried by afferent arteriole enters the glomerular capillary network where this is filtered. The filtration implies that portion of the blood returns to the circulation via the efferent arteriole and the other portion, termed as the glomerular filtrate, enters the proximal tubule of nephron. In nephron tubules (also termed as convoluted tubules) substances of the glomerular filtrate such as ions, water and small organic molecules are resorbed by the cells of the tubule wall and gain once more the circulation. Such cells as well secrete other substances within the tubules. The urine is made of not resorbed filtered substances and of secreted (through tubules) substances.

Urine is drained by collecting ducts to the ureter of each kidney, then it enters the bladder and afterward it is discharged via the urethra. The nephron tubules are enclosed by an extensive capillary network which collects resorbed substances and gives others to be secreted.