reabsorption

• WATER & SALTS

  • As the filtrate drips through the Loop of Henle necessary salts are reabsorbed back into the blood by diffusion and active transport
  • As salts are reabsorbed back into the blood, water follows by osmosis
  • Water is also reabsorbed from the collecting duct in different amounts depending on how much water the body needs at that time

  A) proximal convoluted tube

  B) loop of henle

  C) salts

  D) diffusion

  E) water

  F) osmosis

  G) distal convoluted tube

  H) collecting duct

  I) urine

  J) concentrated

  K) ureter

  L) filtrate

  M) glucose

  
• SELECTIVE REABSORPTION OF GLUCOSE

  • After glomerular filtrate enter Bowman’s Capsule, glucose reabsorbed first @ proximal convoluted tubule by active transport
  • nephron has many mitochondria = energy
  • nowhere else in nephron as gates that facilitate active transport r only found in PCT
  • normal blood glucose level: enough gates to remove all glucose frm filtrate back into blood
  • diabetes: cant control blood glucose levels, often very high = not all glucose filtered out cn be reabsorbed
  • the glucose continues in filtrate -> urine
  • check for diabetes: test urine for presence of glucose
• label

  A) proximal convoluted tube

  B) selective reabsorption

  C) glucose

  D) active

  E) loop of henle

  F) salts

  G) diffusion

  H) water

  I) osmosis

  J) distal convoluted tube

  K) collecting duct

  L) urine

  M) concentrated

  N) ureter

  O) filtrate

  P) glucose

  
• Take care to describe clearly where substances are moving from and to in the kidneys (ie. glucose moves from the filtrate into the bloodstream when it is selectively reabsorbed. Using your technical terminology incorrectly here could lose you marks. Also – small substances such as urea are forced out of the blood during filtration as a result of high-pressure mass flow, they don’t diffuse out of the blood.
• label

  A) collecting duct

  B) loop of henle

  C) proximal convoluted tube

  D) not reabsorbed