Kidney processes part 1

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  • Created by: vezting
  • Created on: 28-04-16 09:59
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  • the kidneys
    • ultrafiltration
      • 1: renal artery enters smaller arterioles in the cortex of the kidney
      • 2: afferent arteriole takes blood into golmerelus
      • 3: efferent arteriole takes filtered blood away from the glomerelus and has it is smaller than afferent and so blood is under higher pressure
      • 4: blood is forced out of the leaky capillaries through the basement membrane and into renal capsule
        • basement membrane is made of collagen and glycoproteins
      • 5: molecules pass through space between podocytes
      • 6: this filtrate of liquid and small particles pass into nephron
    • selective reabsorption
      • 1: occurs in proximal convoluted tubule PCT
      • 2: glucose and amino acids need to get back into the blood as they do not need to be excreted
      • 3: Na+ are actively transported into blood to decrease concn in wall of nephron
      • 4: Na+ moves back in due to conc grad it co-transports amino acid or glucose which is facilitated diffusion
      • 5: amino acids and glucose diffuse out of cell wall and into blood.
      • water is readsorbed here due to low conc grad from gluose and amino acid moving into blood, meaning lower water potential in blood
        • water moves by osmosis
    • water reabsorption
      • 1: descending limb of loop of Henle is permeable to water and ions
      • 2: ascending limb is only permeble to ions
      • 3: in upper ascending limb Na+ and Cl- are actively pumped out,
      • 4: in lower ascending limb they diffuse out
      • 5: ions in the tissue fluid reduce water potential so water moves out of desc. limb
      • the longer the limbs are the more water that can be reabsorbed


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