The Question is from neet-zoology excretory-products-and-their-elimination , and it was created by the author A SUBRAMANYAM

Question

What is the primary function of the tubules in the nephron?

A SUBRAMANYAM · Accepted Answer

## CORE INFORMATION
✓ **Answer**: B
## CONCEPT FRAMEWORK
 **Primary Concept**: Nephron function in the urinary system
 **Related Topics**: Renal physiology, urine formation, reabsorption, secretion
 **Prerequisites**: Basic understanding of the nephron structure (glomerulus, Bowman's capsule, proximal convoluted tubule, loop of Henle, distal convoluted tubule, collecting duct).
## SOLUTION PATHWAY
**Given Information**:
  The question asks about the primary function of the tubules in the nephron.
  The options are: filtration, reabsorption and secretion, erythropoietin production, and urine storage.
**Method & Steps**:
 1. Identify the components of the nephron involved in urine formation.
  Reasoning: The nephron is the functional unit of the kidney responsible for filtering blood and producing urine.  The tubules are the parts of the nephron beyond the Bowman's capsule.
  Formula/Rule: N/A
 2. Analyze the roles of different parts of the nephron.
  Working: The glomerulus filters blood.  The tubules (PCT, loop of Henle, DCT) are primarily responsible for reabsorbing essential substances back into the bloodstream and secreting waste products into the filtrate.  Erythropoietin production occurs in the kidney but is not a primary function of the tubules themselves. The collecting duct contributes to urine concentration, but the primary function of reabsorption and secretion happens in the tubules.
  Key Point:  While the collecting duct plays a role in urine concentration, the tubules are the main sites for the fine-tuning of filtrate composition through reabsorption and secretion.
 3. Determine the primary function of the tubules.
  Result: Reabsorption and secretion are the primary functions of the tubules in the nephron.
  Verification: The tubules modify the filtrate produced by the glomerulus, reabsorbing water, glucose, amino acids, and other essential substances while secreting waste products like hydrogen ions and drugs. This process is crucial for maintaining fluid and electrolyte balance.
 ## OPTION ANALYSIS
A :x: Filtration of blood is the primary function of the glomerulus, not the tubules.
B ✓: Reabsorption and secretion accurately describe the main roles of the tubules in modifying the filtrate.
C :x: Erythropoietin production is an important function of the kidney, but it primarily occurs in specialized cells outside the tubules.
D :x: Storage of urine is the function of the bladder, not the nephron tubules.
 ## LEARNING AIDS
 **Common Mistakes**:
  1.Confusing the functions of the glomerulus and the tubules: Remember that filtration happens in the glomerulus, while reabsorption and secretion are primarily tubular functions.
  2.Overlooking the role of secretion:  Secretion is a crucial process in the tubules, alongside reabsorption.
 **Quick Tips**:
  1.Think of the tubules as fine-tuning the filtrate's composition.
  2.Remember the acronym PCT (proximal convoluted tubule), loop of Henle, and DCT (distal convoluted tubule) to recall the tubular sections involved in reabsorption and secretion.

A SUBRAMANYAM · Answer

Filtration of blood

A SUBRAMANYAM · Answer

The correct Option is "Reabsorption and secretion"

A SUBRAMANYAM · Answer

Production of erythropoietin

A SUBRAMANYAM · Answer

Storage of urine

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