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In the kidney, the formation of urine involve
the following processes arranged as –
the following processes arranged as –
- a)Reabsorption, filtration and secretion
- b)Glomerular filtration, selective reabsorption
and tubular secretion - c)Filtration, secretion and reabsorption
- d)Secretion, absorption and filtration
Correct answer is option 'B'. Can you explain this answer?
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In the kidney, the formation of urine involvethe following processes a...
Formation of urine in the kidney involves the following processes:
1. Glomerular Filtration:
- Occurs in the renal corpuscle within the nephron.
- Blood pressure forces plasma and dissolved substances through the filtration membrane into the glomerular capsule.
- Filtrate contains water, electrolytes, glucose, amino acids, and waste products like urea and creatinine.
2. Selective Reabsorption:
- Occurs in the renal tubules and collecting ducts.
- Essential substances like glucose, amino acids, and electrolytes are reabsorbed from the filtrate back into the bloodstream.
- Water is also reabsorbed to maintain fluid balance.
- Waste products and excess substances remain in the tubules.
3. Tubular Secretion:
- Occurs in the renal tubules and collecting ducts.
- Substances like hydrogen ions, potassium ions, and certain drugs are actively transported from the peritubular capillaries into the tubules.
- This process helps regulate pH and eliminate additional waste products.
Overall Process:
- Glomerular filtration first occurs, where blood is filtered and forms the initial filtrate.
- Selective reabsorption then takes place, where essential substances and water are reabsorbed back into the bloodstream.
- Tubular secretion occurs simultaneously, where additional waste products and substances are actively secreted into the tubules.
- The remaining fluid, now known as urine, flows through the collecting ducts and is eventually excreted from the body.
Therefore, the correct answer is B: Glomerular filtration, selective reabsorption, and tubular secretion.
1. Glomerular Filtration:
- Occurs in the renal corpuscle within the nephron.
- Blood pressure forces plasma and dissolved substances through the filtration membrane into the glomerular capsule.
- Filtrate contains water, electrolytes, glucose, amino acids, and waste products like urea and creatinine.
2. Selective Reabsorption:
- Occurs in the renal tubules and collecting ducts.
- Essential substances like glucose, amino acids, and electrolytes are reabsorbed from the filtrate back into the bloodstream.
- Water is also reabsorbed to maintain fluid balance.
- Waste products and excess substances remain in the tubules.
3. Tubular Secretion:
- Occurs in the renal tubules and collecting ducts.
- Substances like hydrogen ions, potassium ions, and certain drugs are actively transported from the peritubular capillaries into the tubules.
- This process helps regulate pH and eliminate additional waste products.
Overall Process:
- Glomerular filtration first occurs, where blood is filtered and forms the initial filtrate.
- Selective reabsorption then takes place, where essential substances and water are reabsorbed back into the bloodstream.
- Tubular secretion occurs simultaneously, where additional waste products and substances are actively secreted into the tubules.
- The remaining fluid, now known as urine, flows through the collecting ducts and is eventually excreted from the body.
Therefore, the correct answer is B: Glomerular filtration, selective reabsorption, and tubular secretion.
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In the kidney, the formation of urine involvethe following processes a...
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In the kidney, the formation of urine involvethe following processes arranged as –a)Reabsorption, filtration and secretionb)Glomerular filtration, selective reabsorptionand tubular secretionc)Filtration, secretion and reabsorptiond)Secretion, absorption and filtrationCorrect answer is option 'B'. Can you explain this answer?
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