Ijmb Model Questions Vol1 2024 Biology Question 5

Practice essay / theory question 5 from the 2024 Ijmb Model Questions Vol1 Biology examination. This question covers Transport .

Ijmb Model Questions Vol1 2024 Biology Essay / Theory
Topic: Transport
Question 5 IJMB_MODEL_QUESTIONS_VOL1 • 2024 • BIOLOGY • essay

A healthy adult male is traveling from sea level to a high‑altitude region (approximately 3000 m above sea level).

Question Parts

( a )
Describe the complete pathway that blood follows from the right ventricle of the heart to the alveolar capillaries, the gas‑exchange process that occurs there, and the return route to the left atrium.
( b )
Explain how the diffusion of O₂ across the alveolar–capillary membrane is driven, and discuss qualitatively how a fall in atmospheric pressure at high altitude influences this diffusion process.
( c )
Using the alveolar gas equation, calculate the approximate alveolar PO₂ at the altitude of 3000 m. Assume: atmospheric pressure at sea level = 760 mmHg, at 3000 m = 523 mmHg; fraction of inspired O₂ (FIO₂) = 0.21; water vapour pressure (PH₂O) = 47 mmHg; arterial PCO₂ = 40 mmHg; respiratory quotient (R) = 0.8.
( d )
Briefly discuss two major physiological adaptations that help maintain adequate tissue oxygen delivery when a person resides at high altitude.

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About This Question

This is Ijmb Model Questions Vol1 2024 Biology Question 5. It is one of the essay questions from the 2024 Ijmb Model Questions Vol1 Biology examination.

The question covers Transport .

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