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Water is reabsorbed by
Option: 1
Secondary active transport
Option: 2
Primary active transport
Option: 3
Osmosis
Option: 4
Facilitated diffusion
Answers (1)
Urine Formation: Tubular Reabsorption in PCT -
- A comparison of the volume of the filtrate formed per day (180 litres per day) with that of the urine released (1.5 litres), suggest that nearly 99 percent of the filtrate has to be reabsorbed by the renal tubules.
- This process is called reabsorption.
- This process involves both passive and active transport across the tubular epithelium.
Tubular Reabsorption in PCT:
- About 65% of the reabsorption occurs in the PCT.
- Glucose, amino acids, vitamins, hormones, sodium, potassium, chlorides, phosphates, bicarbonates, much of water and urea from the filtrate are absorbed.
- Sulphates and creatinine are not reabsorbed.
- Sodium and potassium are reabsorbed by the primary active transport.
- Glucose and amino acids are reabsorbed by the secondary active transport.
- Water is reabsorbed by osmosis.
-
Water is reabsorbed by osmosis. Hence, the correct option is c, osmosis
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