18 In the descending limb of the loop of Henle water is reabsorbed back into

18 in the descending limb of the loop of henle water

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18. In the descending limb of the loop of Henle water is reabsorbed back into our blood. 19. In the ascending limb of the loop of Henle 25% of NaCI is reabsorbed. 20. In the distal convoluted tubule these 2 substances are reabsorbed: (i) NaCI (5%) (ii) H 2 O 21. Our nephrons reabsorb NaCl (salt) and this enables water to be then be reabsorbed. The water moves because it follows the osmotic gradient. 22. In the distal convoluted tubule these 2 ions are secreted from our blood into the filtrate: (i) Potassium ions (ii) Hydrogen ions 23. Reabsorption is done mostly by the proximal tubule. Secretion is done mostly by the proximal tubule. Concentration of the filtrate is done mostly by the loop of Henle. Fine tuning of the concentrations is done mostly by the distal tubule . 24. One last bit of reabsorption occurs in the collecting duct. List the 3 substances that are reabsorbed: (i) Urea (ii) NaCI (5%) (iii) H 2 O 25. List the 6 main components of the filtrate that are excreted. (i) H 2 O (ii) NaCI (iii) K+ (iv) HCO 3 - (v) Creatinine (vi) Urea 26. Which of these six substances is used as a marker for glomerular filtration rate (because it enters the nephron via filtration and is not reabsorbed or secreted)? Creatinine 27. The rate of water excretion is controlled by two hormones. List these 2 hormones: (i) Aldosterone (ii) Antidiuretic hormone (ADH) or Vasopressin
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  • Spring '08
  • BAH
  • Kidney anatomy, Nephron, Distal Convoluted Tubule, Metanephric blastema, Glomerulus, loop of Henle

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