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Select the correct answer about proximal convoluted tubules of nephrons.
- a)K+ is secreted in an exchange with the Na+ which is reabsorbed under the effect of aldosterone
- b)Glucose, amino acids and proteins are completely reabsorbed
- c)Only 10% of the filtered water is reabsorbed
- d)Parathormone increase phosphate reabsorption
Correct answer is option 'B'. Can you explain this answer?
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Select the correct answer about proximal convoluted tubules of nephro...
The major steps of urine formation are:
- Glomerular filtration or ultrafiltration
- Tubular reabsorption
- Tubular secretion
The proximal convoluted tubules reabsorb all glucose, amino acids, vitamins and hormones, along with most of the mineral ions (~80%) and water. Mineral ions and vitamins are actively transported by protein pumps and carrier proteins respectively. Glucose and amino acids are co-transported across the apical membrane with sodium (symport). Water follows the movement of the mineral ions passively via osmosis.
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Select the correct answer about proximal convoluted tubules of nephro...
Reabsorption in Proximal Convoluted Tubules of Nephrons
Reabsorption in the proximal convoluted tubules of nephrons is a crucial process in the kidney's function to maintain homeostasis. Here's an explanation of the statement:
Glucose, Amino Acids, and Proteins are Completely Reabsorbed
- The proximal convoluted tubules are responsible for reabsorbing essential substances like glucose, amino acids, and proteins back into the bloodstream.
- These molecules are actively transported from the tubular fluid into the peritubular capillaries, ensuring that valuable nutrients are not lost in the urine.
K+ is Secreted in Exchange with Na+ Reabsorption
- Potassium (K+) is primarily secreted in the proximal convoluted tubules in exchange for the reabsorption of sodium (Na+).
- This process helps regulate the balance of electrolytes in the body and is influenced by hormones like aldosterone.
Filtered Water Reabsorption
- Approximately 65-70% of the filtered water is reabsorbed in the proximal convoluted tubules.
- This reabsorption occurs passively through osmosis, driven by the reabsorption of solutes like sodium and glucose.
Parathormone and Phosphate Reabsorption
- Parathormone plays a role in controlling calcium and phosphate levels in the blood but primarily affects phosphate reabsorption in the distal convoluted tubules rather than the proximal convoluted tubules.
In summary, the proximal convoluted tubules play a vital role in reabsorbing essential substances while also facilitating the exchange of electrolytes like K+ and Na+. Understanding these processes is crucial for comprehending kidney function and overall physiological balance.
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Select the correct answer about proximal convoluted tubules of nephrons.a)K+ is secreted in an exchange with the Na+ which is reabsorbed under the effect of aldosteroneb)Glucose, amino acids and proteins are completely reabsorbedc)Only 10% of the filtered water is reabsorbedd)Parathormone increase phosphate reabsorptionCorrect answer is option 'B'. Can you explain this answer?
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