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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
Reabsorption in the proximal convoluted tubules of nephrons plays a crucial role in maintaining the body's water and electrolyte balance. Here's why:
- Glucose, Amino Acids, and Proteins
- The proximal convoluted tubules are responsible for reabsorbing nearly all of the glucose, amino acids, and proteins filtered by the glomerulus. This reabsorption ensures that these essential substances are not lost in the urine and are retained in the body for various metabolic processes.
- Water Reabsorption
- Approximately 65-70% of the filtered water is reabsorbed in the proximal convoluted tubules. This high reabsorption rate helps in maintaining the body's fluid balance and preventing dehydration.
- Electrolyte Reabsorption
- Along with glucose and proteins, electrolytes like sodium, potassium, and chloride are also reabsorbed in the proximal convoluted tubules. This reabsorption helps in maintaining the body's electrolyte balance and proper functioning of various physiological processes.
- Hormonal Regulation
- Hormones like aldosterone and parathyroid hormone play a role in modulating the reabsorption of certain substances in the proximal convoluted tubules. For example, aldosterone promotes sodium reabsorption in exchange for potassium secretion, while parathyroid hormone increases phosphate reabsorption in response to low blood calcium levels.
In conclusion, the proximal convoluted tubules are vital for reabsorbing essential substances like glucose, amino acids, and proteins, as well as regulating water and electrolyte balance in the body. This intricate reabsorption process ensures that the body maintains homeostasis and functions optimally.
Reabsorption in the proximal convoluted tubules of nephrons plays a crucial role in maintaining the body's water and electrolyte balance. Here's why:
- Glucose, Amino Acids, and Proteins
- The proximal convoluted tubules are responsible for reabsorbing nearly all of the glucose, amino acids, and proteins filtered by the glomerulus. This reabsorption ensures that these essential substances are not lost in the urine and are retained in the body for various metabolic processes.
- Water Reabsorption
- Approximately 65-70% of the filtered water is reabsorbed in the proximal convoluted tubules. This high reabsorption rate helps in maintaining the body's fluid balance and preventing dehydration.
- Electrolyte Reabsorption
- Along with glucose and proteins, electrolytes like sodium, potassium, and chloride are also reabsorbed in the proximal convoluted tubules. This reabsorption helps in maintaining the body's electrolyte balance and proper functioning of various physiological processes.
- Hormonal Regulation
- Hormones like aldosterone and parathyroid hormone play a role in modulating the reabsorption of certain substances in the proximal convoluted tubules. For example, aldosterone promotes sodium reabsorption in exchange for potassium secretion, while parathyroid hormone increases phosphate reabsorption in response to low blood calcium levels.
In conclusion, the proximal convoluted tubules are vital for reabsorbing essential substances like glucose, amino acids, and proteins, as well as regulating water and electrolyte balance in the body. This intricate reabsorption process ensures that the body maintains homeostasis and functions optimally.
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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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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? for NEET 2024 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about 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? covers all topics & solutions for NEET 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for 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?.
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? for NEET 2024 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about 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? covers all topics & solutions for NEET 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for 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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