Question

state the functions of tubules

Answer 1

The major function of tubules is reabsorption and the process can either be active or passive. In addition, secretions bytubules help in the urine formation without affecting the electrolyte balance of the body.

Answer 2

1)proximal convoluted tubule(PCT )
PCT is lined by the simple cuboidal brush border epithelium which increase the surface area for reabsorption nearly all the essential nutrients and 70 to 80% of electrolytes and the water are reabsorbed by this segment pct also helps to maintain the pH and the ionic balance of the body Fluids by selective secretion of hydrogen ions ammonium and potassium ions into the filtrate and by absorption of HCO3- Ion from it

2)henle's loop reabsorption in this segment is minimum however this region plays a significant role in the maintenance of high osmolarity of medullary intestinal fluid. the descending limb of loop of Henle is permeable to water but almost impermeable to electrolytes this concentrate the filtrate as it moves down the ascending limb is impermeable to water but allows transport of electrolytes actively or passively therefore as the concentrated filtrate pass up down it gets diluted due to the passage of electrolytes to the middle arey fluid

3)distal convoluted tubule (dct)
conditional reabsorption of enerplus and water takes place in this segment DCT is also capable of reabsorption of HCO 3 - selective secretion of hydrogen and potassium ions and NH3 to maintain the pH and Sodium Potassium balance in the blood


4)collecting duct
this long that extends from the cortex of the kidney to inner parts of the medula large amounts of water could be reabsorbed from this region to produce the concentrated urine this segments are lost passage of small amounts of Urea into the medulary interstitium
to keep up the osmolarity it also play a role in maintenance of the pH and the ionic balance of the blood by the selective secretion of H+ and K + ions

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