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The formation of urine.
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| Submitted: Mon Apr 05 2004
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The formation of urine. In humans, about 1 - 1.5 litres of urine are formed each day. The nephrons produce this urine in a continuous process. However, we can divide up this process to show how nephrons construct urine. i. The Glomerulus: The glomerulus resembles a twisted mass of tiny tubes through which blood passes. The kidney receives this blood from the first branch of the aorta, so the blood is under high pressure when it reaches the nephron. This pressure is maintained and enhanced because of the afferent arteriole,the blood vessel that takes blood to the glomerulus, is short and has a larger diameter than the longer efferent arteriole that takes blood away. In the glomerulus, water and relatively small molecules within the blood plasma, including essential ions, glucose and amino acids, are forced out of the blood along with urea and across into the capsules inner compartment. The glomerulus...
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