Thursday, 3 November 2011

2.70 Nephron Structure

Describe the structure of a nephron, to cinclude Bowman's capsule and glomerulus, convoluted tubules, loop of Henle and collecting duct.

  • Nephron is the functional unit of the kidney. The part that does the filtration and of the composition of blood.
  • The aorta brings blood and through the renal artery reaches the kidney and waste (urine) then goes through the ureter to the bladder.
  • The filtered blood exits the renal vein and return to the vena cava. If we slice through the kidney we see different colored region, the lighter colored region is called the cotex and the inner, slightly colored region is called the medulla and the lighter colored space is the pelvic region.
  •  In this space it is where the urine collects and drains down the ureter.
  •  The region of the different color is because the kidney is made up of millions of tubes.
  •  The tube starts on the edge of the medulla and moves directly upwards through the medulla and up through the cortex and then will reach a dead-end and is called the bowman's capsule.

If we look at this is more detail we will be looking at the nephron.
  • The tubular structure is called the nephron.
  • Above the dotted line is the cortex and below the dotted line is the medulla.
  • At the end of this tube it will be the pelvic region and its at this place where the urine emerges.
  • The twisted part is called the convoluted tubules and the end tube is called the collecting duct.
  • The dip in the middle is called the loop of henle.
  • The dead end is called the bowman's capsule. The tight knot of blood vessel is called the glomerulus.
  • The first twisted section is called the proximal convoluted tubule (PCT).
  • The second twisted section is called the distal convoluted tubule (DCT).
  • It's the arrangement which gives the different colored region of the kidney. There are millions of nephrons in a kidney.

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