2.74B the structure of a nephron

  • Created by: Almaaz
  • Created on: 25-09-19 20:59

the structure of a nephron

  • 1)  The​ renal artery​ transports oxygenated blood to the ​Bowman’s capsule​ under high pressure

  • 2)  In the ​glomerulus​ (ball of capillaries within the capsule) the pressure increases even further as the capillaries leaving (​efferent​ arteriole = exiting to renal vein) is narrower than the capillary entering(​afferent arteriole)

  • 3)  This pressure leads to ​ultrafiltration - water, salts, glucose and urea pass out of the capillary and into the Bowman’s capsule and into the tubules.

  • 4)  Proteins and blood cells are too big to leave the capillaries and so stay within the blood

  • 5)  All ​glucose​ is reabsorbed at the​ proximal convoluted tubule​ by ​active transport,​ whilst the rest of the filtrate continues through the tubules. There are many ​mitochondria​ here to provide the energy for active transport.

  • 6)  Salts are reabsorbed by the​ loop of Henle

  • 7)  Water is reabsorbed into the blood at the​ collecting ducts,​ depending on the water levels in the body (and therefore ADH produced)

  • 8)  The remaining filtrate (water, salts and urea) in the collecting duct will form ​urine

  • 9)  This is transported through the ​ureters​ to be stored in the bladder and then through the urethra​ to leave the body

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