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What is the primary function of the Proximal Convoluted Tubule (PCT) in the nephron?
- a)Selective secretion of electrolytes
- b)Reabsorption of essential nutrients
- c)Filtration of waste products
- d)Regulation of blood pressure
Correct answer is option 'B'. Can you explain this answer?
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What is the primary function of the Proximal Convoluted Tubule (PCT) i...
The primary function of the Proximal Convoluted Tubule (PCT) is the reabsorption of essential nutrients, electrolytes, and water. This segment is lined by simple cuboidal brush border epithelium, which significantly increases the surface area for reabsorption. Nearly all essential nutrients and a significant portion of electrolytes and water are reabsorbed in the PCT. This process is crucial for maintaining the body's overall balance of nutrients and fluids.
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What is the primary function of the Proximal Convoluted Tubule (PCT) i...
Primary Function of the Proximal Convoluted Tubule (PCT)
The Proximal Convoluted Tubule (PCT) plays a crucial role in the nephron, primarily focusing on the reabsorption of essential nutrients.
Overview of the PCT
- The PCT is the first segment of the renal tubule after the Bowman's capsule.
- It is lined with epithelial cells that have microvilli, increasing the surface area for absorption.
Reabsorption of Essential Nutrients
- The PCT reabsorbs approximately 65-70% of the filtrate produced in the glomerulus.
- Key nutrients reabsorbed include:
- Glucose: Almost all filtered glucose is reabsorbed through specific transporters.
- Amino Acids: The PCT reabsorbs nearly all amino acids via active transport.
- Bicarbonate: Important for maintaining acid-base balance in the body.
- Electrolytes: Sodium and potassium ions are also reabsorbed, which is crucial for maintaining fluid balance.
Mechanisms of Reabsorption
- Active Transport: Utilizes energy to move molecules against their concentration gradient.
- Passive Diffusion: Some substances move along their concentration gradient without energy expenditure.
- Co-Transport: Nutrients like glucose and amino acids are often reabsorbed alongside sodium ions.
Importance of PCT Function
- Efficient nutrient reabsorption prevents the loss of vital substances in urine.
- It plays a significant role in regulating body fluid composition and ensuring homeostasis.
In summary, the primary function of the Proximal Convoluted Tubule is the reabsorption of essential nutrients, making it vital for maintaining overall health and metabolic balance.
The Proximal Convoluted Tubule (PCT) plays a crucial role in the nephron, primarily focusing on the reabsorption of essential nutrients.
Overview of the PCT
- The PCT is the first segment of the renal tubule after the Bowman's capsule.
- It is lined with epithelial cells that have microvilli, increasing the surface area for absorption.
Reabsorption of Essential Nutrients
- The PCT reabsorbs approximately 65-70% of the filtrate produced in the glomerulus.
- Key nutrients reabsorbed include:
- Glucose: Almost all filtered glucose is reabsorbed through specific transporters.
- Amino Acids: The PCT reabsorbs nearly all amino acids via active transport.
- Bicarbonate: Important for maintaining acid-base balance in the body.
- Electrolytes: Sodium and potassium ions are also reabsorbed, which is crucial for maintaining fluid balance.
Mechanisms of Reabsorption
- Active Transport: Utilizes energy to move molecules against their concentration gradient.
- Passive Diffusion: Some substances move along their concentration gradient without energy expenditure.
- Co-Transport: Nutrients like glucose and amino acids are often reabsorbed alongside sodium ions.
Importance of PCT Function
- Efficient nutrient reabsorption prevents the loss of vital substances in urine.
- It plays a significant role in regulating body fluid composition and ensuring homeostasis.
In summary, the primary function of the Proximal Convoluted Tubule is the reabsorption of essential nutrients, making it vital for maintaining overall health and metabolic balance.
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What is the primary function of the Proximal Convoluted Tubule (PCT) in the nephron?a) Selective secretion of electrolytesb) Reabsorption of essential nutrientsc) Filtration of waste productsd) Regulation of blood pressureCorrect answer is option 'B'. Can you explain this answer? for NEET 2025 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about What is the primary function of the Proximal Convoluted Tubule (PCT) in the nephron?a) Selective secretion of electrolytesb) Reabsorption of essential nutrientsc) Filtration of waste productsd) Regulation of blood pressureCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for NEET 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for What is the primary function of the Proximal Convoluted Tubule (PCT) in the nephron?a) Selective secretion of electrolytesb) Reabsorption of essential nutrientsc) Filtration of waste productsd) Regulation of blood pressureCorrect answer is option 'B'. Can you explain this answer?.
What is the primary function of the Proximal Convoluted Tubule (PCT) in the nephron?a) Selective secretion of electrolytesb) Reabsorption of essential nutrientsc) Filtration of waste productsd) Regulation of blood pressureCorrect answer is option 'B'. Can you explain this answer? for NEET 2025 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about What is the primary function of the Proximal Convoluted Tubule (PCT) in the nephron?a) Selective secretion of electrolytesb) Reabsorption of essential nutrientsc) Filtration of waste productsd) Regulation of blood pressureCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for NEET 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for What is the primary function of the Proximal Convoluted Tubule (PCT) in the nephron?a) Selective secretion of electrolytesb) Reabsorption of essential nutrientsc) Filtration of waste productsd) Regulation of blood pressureCorrect answer is option 'B'. Can you explain this answer?.
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