kidney
Function: Urine Formation and Excretion. Urine is composed of unwanted substances that have been filtered from the blood by nephrons, the functional units of the kidneys. The urine formed in the kidneys passes through the ureters and is temporarily stored in the bladder. From here it is emptied, normally under voluntary control, through the urethra. Urine is formed in the kidneys, specifically by the renal tubules in the nephrons of the kidneys. It then is collected by the renal pelvis, where it exits though the ureters, moves to the bladder where it is stored until urination, during which it is expelled through the urethra. The kidneys are bean-shaped organs which help the body produce urine to get rid of unwanted waste substances. When urine is formed, tubes called ureters transport it to the urinary bladder, where it is stored and excreted via the urethra. Urine Formation. Urine is formed through a combination of four basic processes: 1) glomerular filtration, 2) tubular reabsorption, 3) tubular secretion, and 4) water conservation. Blood is under high pressure in the glomerulus; thus, plasma (except for plasma proteins) moves into the glomerular capsule. The kidneys filter blood to form/produce urine in the body. It is  then moved into the bladder and eliminated from the bladder through  the urinary tract. Kidney fitres out … 180 litres of blood to form 0.5 to 2 litres of  urine /day. This urine is collected in urinary bldder. Urine is formed in the kidneys in cellular structures known as renal parenchyma. Urine is the filtrate of blood traversing the microscopic pathways from the glomerulus to the proximal convoluted tubule, the loop of henle, and the distal convuluted tubule which is where the final condensed urine is collected. Kidney Structure and Function  Once urine is formed, it passes into a cavity called the minor calyx.  Multiple minor calyces drain into the major calyx.  The major calyx empties into ureters that drain the kidney.  From there, the ureters empty into the urinary bladder where urine is stored.
http://www.aviva.co.uk/health-insurance/home-of-health/medical-centre/medical-encyclopedia/entry/function-urine-formation-and-excretion/ http://www.answers.com/Q/Where_is_urine_formed http://www.myvmc.com/anatomy/urinary-system-renal-system/ http://www.mhhe.com/biosci/esp/2001_saladin/folder_structure/ab/m2/s3/ http://www.answers.com/Q/Where_is_urine_formed http://www.answers.com/Q/What_is_the_medical_term_meaning_Microscopic_tube_where_urine_is_formed http://bio.classes.ucsc.edu/bio131/Thometz%20Website/17%20Osmoregulation%20II%20PPT.pdf
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