Ijmb Model Questions Vol1 2025 Biology Question 5

Practice essay / theory question 5 from the 2025 Ijmb Model Questions Vol1 Biology examination. This question covers Transport, Digestive system, Absorption .

Ijmb Model Questions Vol1 2025 Biology Essay / Theory
Topics: Transport Digestive system Absorption
Question 5 IJMB_MODEL_QUESTIONS_VOL1 • 2025 • BIOLOGY • essay

A researcher is studying the transport of glucose in the human small intestine after a meal rich in carbohydrates.

Question Parts

( a )
Explain the mechanism by which glucose is absorbed from the intestinal lumen into the enterocytes, including the role of sodium.
( b )
After absorption into enterocytes, describe the two main pathways by which glucose enters the bloodstream, indicating the transport proteins involved.
( c )
A patient has a genetic defect that reduces the activity of the Na⁺/K⁺‑ATPase in intestinal epithelial cells by 40 %. Predict qualitatively how this defect would affect the efficiency of glucose absorption and justify your answer.
( d )
Given that the normal rate of glucose absorption is 0.5 g per minute, estimate the new absorption rate in the patient described in (c) assuming the reduction in Na⁺/K⁺‑ATPase activity proportionally reduces the sodium gradient driving secondary active transport. Show your reasoning.

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About This Question

This is Ijmb Model Questions Vol1 2025 Biology Question 5. It is one of the essay questions from the 2025 Ijmb Model Questions Vol1 Biology examination.

The question covers Transport, Digestive system, Absorption .

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