Describe the process of urine formation in man
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Urine production occurs in structures in kidneys called nephrons.
At the beginning of the nephron, unfiltered blood containing urea, waste products and useful products is filtered, and the filtrate is collected in the Bowman’s capsule. The waste continues to travel along the nephron to the proximal convoluted tubule where useful products e.g.glucose and required water are selectively reabsorbed back into the bloodstream. Eventually, all that is left in the nephron is waste and excess water, which mix to form urine. This passes to the end of the nephron, through the ureters to the urethra. The urine is then stored in the bladder, which is held closed by the Sphincter muscle until the person decides to urinate.
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At the beginning of the nephron, unfiltered blood containing urea, waste products and useful products is filtered, and the filtrate is collected in the Bowman’s capsule. The waste continues to travel along the nephron to the proximal convoluted tubule where useful products e.g.glucose and required water are selectively reabsorbed back into the bloodstream. Eventually, all that is left in the nephron is waste and excess water, which mix to form urine. This passes to the end of the nephron, through the ureters to the urethra. The urine is then stored in the bladder, which is held closed by the Sphincter muscle until the person decides to urinate.
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