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Q3(e):
Indicate whether the following statements are true or false : (e) Glucose is actively reabsorbed in the proximal convoluted tubule.
Solution :
Step 1: Analyzing the Physiological Statement
The statement posits that glucose is actively reabsorbed in the proximal convoluted tubule (PCT). To evaluate this, we must analyze the transport mechanisms governing solute recovery in the nephron.
Step 2: Theoretical Foundation of Renal Reabsorption
Reabsorption in the PCT is a highly selective process. The proximal convoluted tubule is responsible for the reabsorption of approximately $100\%$ of filtered glucose, amino acids, and the majority of electrolytes under normal physiological conditions [Per the principle of selective reabsorption in the nephron].
Step 3: Mechanism of Glucose Transport
Glucose reabsorption does not occur via simple diffusion because the concentration of glucose in the tubular fluid is typically lower than in the peritubular capillary blood. Therefore, the process must occur against the concentration gradient:
- Secondary Active Transport: Glucose is transported across the apical membrane (luminal side) of the PCT epithelial cells by Sodium-Glucose Linked Transporters (SGLTs). This utilizes the electrochemical gradient of $Na^+$ established by the $Na^+/K^+$-ATPase pump located on the basolateral membrane [Reference: Active Transport Mechanism].
- Facilitated Diffusion: Once inside the PCT cell, glucose moves down its concentration gradient into the interstitial fluid (and subsequently the blood) through GLUT transporters (glucose uniporters) on the basolateral membrane.
Step 4: Visualizing the PCT Transport Mechanism
Step 5: Logical Deduction
Since the transport of glucose across the apical membrane requires coupling with the $Na^+$ gradient maintained by active metabolic expenditure ($Na^+/K^+$-ATPase), the process is classified as active reabsorption.
Conclusion: The statement "Glucose is actively reabsorbed in the proximal convoluted tubule" is True.
Final Solution: True. The process involves secondary active transport mediated by SGLT proteins at the apical membrane of the proximal convoluted tubule cells.
More Questions from Class 11 Biology Excretory Products and Elimination EXERCISES
- Q1: Define Glomerular Filtration Rate (GFR)
- Q2: Explain the autoregulatory mechanism of GFR.
- Q3(a): Indicate whether the following statements are true or false : (a) Micturition is carried out by a reflex.
- Q3(b): Indicate whether the following statements are true or false : (b) ADH helps in water elimination, making the urine hypotonic.
- Q3(c): Indicate whether the following statements are true or false : (c) Protein-free fluid is filtered from blood plasma into the Bowman’s capsule.
- Q3(d): Indicate whether the following statements are true or false : (d) Henle’s loop plays an important role in concentrating the urine.
- Q4: Give a brief account of the counter current mechanism.
- Q5: Describe the role of liver, lungs and skin in excretion.
- Q6: Explain micturition.
- Q7: Match the items of column I with those of column II : Column I Column II (a) Ammonotelism (i) Birds (b) Bowman’s capsule (ii) Water reabsorption (c) Micturition (iii) Bony fish (d) Uricotelism (iv) Urinary bladder (e) ADH (v) Renal tubule
- Q8: What is meant by the term osmoregulation?
- Q9: Terrestrial animals are generally either ureotelic or uricotelic, not ammonotelic, why ?
- Q10: What is the significance of juxta glomerular apparatus (JGA) in kidney function?
- Q11(a): Name the following: (a) A chordate animal having flame cells as excretory structures
- Q11(b): Name the following: (b) Cortical portions projecting between the medullary pyramids in the human kidney
- Q11(c): Name the following: (c) A loop of capillary running parallel to the Henle’s loop.
- Q12(a): Fill in the gaps : (a) Ascending limb of Henle’s loop is _______ to water whereas the descending limb is _______ to it.
- Q12(b): Fill in the gaps : (b) Reabsorption of water from distal parts of the tubules is facilitated by hormone _______.
- Q12(c): Fill in the gaps : (c) Dialysis fluid contain all the constituents as in plasma except _______.
- Q12(d): Fill in the gaps : (d) A healthy adult human excretes (on an average) _______ gm of urea/day.
CBSE Solutions for Class 11 Biology Excretory Products and Elimination
Chapters in CBSE - Class 11 Biology
- The Living World
- Biological Classification
- Plant Kingdom
- Animal Kingdom
- Morphology of Flowering Plants
- Anatomy of Flowering Plants
- Structural Organisation in Animals
- Cell – The Unit of Life
- Biomolecules
- Cell Cycle and Division
- Transport in Plants
- Mineral Nutrition
- Photosynthesis
- Respiration in Plants
- Plant Growth and Development
- Digestion and Absorption
- Breathing and Exchange of Gases
- Body Fluids and Circulation
- Locomotion and Movement
- Neural Control and Coordination
- Chemical Coordination and Integration
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