Waec Model Questions Vol1 2024 Biology Question 4

Practice essay / theory question 4 from the 2024 Waec Model Questions Vol1 Biology examination. This question covers Respiration, Altitude physiology, Ventilatory control .

Waec Model Questions Vol1 2024 Biology Essay / Theory

Topics: Respiration Altitude physiology Ventilatory control

Question 4 WAEC_MODEL_QUESTIONS_VOL1 • 2024 • BIOLOGY • essay

A group of secondary school students undertakes a three‑day trek to a mountain camp situated at an altitude of 3000 m above sea level. At sea level the ambient partial pressure of oxygen (PO₂) is 160 mmHg, giving an alveolar PO₂ of about 100 mmHg. At 3000 m the ambient PO₂ falls to 100 mmHg, resulting in an alveolar PO₂ of roughly 70 mmHg. Answer the following questions:

Question Parts

( a )

Explain the immediate respiratory response of the students when they first arrive at the altitude, describing the changes in ventilation rate and depth and the physiological basis for these changes.

( b )

Describe the longer‑term (acclimatization) respiratory adaptations that occur if the students remain at this altitude for several weeks.

( c )

Identify two health risks associated with high‑altitude exposure for adolescents and suggest one preventive measure for each risk.

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About This Question

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

The question covers Respiration, Altitude physiology, Ventilatory control .

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