Igcse Model Questions Vol1 2024 Biology Question 4

Practice essay / theory question 4 from the 2024 Igcse Model Questions Vol1 Biology examination. This question covers respiration, human anatomy, gas exchange .

Igcse Model Questions Vol1 2024 Biology Essay / Theory
Topics: respiration human anatomy gas exchange
Question 4 IGCSE_MODEL_QUESTIONS_VOL1 • 2024 • BIOLOGY • essay
Igcse Model Questions Vol1 2024 Biology Question 4 diagram

The diagram shows the major structures of the human respiratory system.

Question Parts

( a )
Write the correct name of each labelled part (1‑7) shown in the diagram.
( b )
Explain the pathway of air from the external environment to the site of gas exchange, mentioning at least four structures in the correct order.
( c )
Using the alveolar gas equation, calculate the alveolar partial pressure of oxygen (PAO₂) at sea level and at an altitude of 3000 m. Use the following data: - Fraction of inspired oxygen (FIO₂) = 0.21 - Water vapour pressure in the alveoli (PH₂O) = 47 mmHg - Arterial carbon dioxide pressure (PaCO₂) = 40 mmHg - Respiratory quotient (R) = 0.8 - Atmospheric pressure at sea level = 760 mmHg - Atmospheric pressure at 3000 m = 523 mmHg Show all steps and state any assumptions.
( d )
Briefly describe two physiological mechanisms that help maintain oxygen uptake when a person moves from sea level to high altitude.

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About This Question

This is Igcse Model Questions Vol1 2024 Biology Question 4. It is one of the essay questions from the 2024 Igcse Model Questions Vol1 Biology examination.

The question covers respiration, human anatomy, gas exchange .

View More Igcse Model Questions Vol1 2024 Biology Questions More Igcse Model Questions Vol1 Practice Questions Back to Questions

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